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Productive and receptive
The first major distinction that must be made when evaluating word knowledge is whether the knowledge is productive (also called active) or receptive (also called passive) and even within those opposing categories, there is often times no clear distinction. Words that are generally understood when heard or read or seen constitute a person's receptive vocabulary. These words may range from well-known to barely known (see degree of knowledge below). In most cases, a person's receptive vocabulary is the larger of the two. For example, although a young child may not yet be able to speak, write, or sign, he or she may be able to follow simple commands and appear to understand a good portion of the language to which he or she is exposed. In this case, the child's receptive vocabulary is likely tens, if not hundreds of words but his or her active vocabulary is zero. When that child learns to speak or sign, however, the child's active vocabulary begins to increase. Productive vocabulary, therefore, generally refers to words which can be produced within an appropriate context and match the intended meaning of the speaker or signer. As with receptive vocabulary, however, there are many degrees at which a particular word may be considered part of an active vocabulary. Knowing how to pronounce, sign, or write a word does not necessarily mean that the word has been used correctly or accurately reflect the intended message of the utterance, but it does reflect a minimal amount of productive knowledge.
Degree of knowledge
Within the receptive / productive distinction lies a range of abilities which are often referred to as degree of knowledge. This simply indicates that a word gradually enters a person's vocabulary over a period of time as more aspects of word knowledge are learnt. Roughly, these stages could be described as:

Never encountered the word.
Heard the word, but cannot define it.
Recognize the word due to context or tone of voice.
Able to use the word but cannot clearly explain it.
Fluent with the word – its use and definition.

Depth of knowledge
The differing degrees of word knowledge imply a greater depth of knowledge, but the process is more complex than that. There are many facets to knowing a word, some of which are not hierarchical so their acquisition does not necessarily follow a linear progression suggested by degree of knowledge. Several frameworks of work knowledge have been proposed to better operationalise this concept. One such framework includes nine facets:

orthography - written form
phonology - spoken form
reference - meaning
semantics - concept and reference
register - appropriacy of use
collocation - lexical neighbours
word associations
syntax - grammatical function
morphology - word parts

Types of vocabulary
Listed in order of most ample to most limited:[2][3]
Reading vocabulary
A person's reading vocabulary is all the words he or she can recognize when reading. This is the largest type of vocabulary simply because it includes the other three.
Listening vocabulary
A person's listening vocabulary is all the words he or she can recognize when listening to speech. This vocabulary is aided in size by context and tone of voice.
Writing vocabulary
A person's writing vocabulary is all the words he or she can employ in writing. Contrary to the previous two vocabulary types, the writing vocabulary is stimulated by its user.
Speaking vocabulary
A person's speaking vocabulary is all the words he or she can use in speech. Due to the spontaneous nature of the speaking vocabulary, words are often misused. This misuse – though slight and unintentional – may be compensated by facial expressions, tone of voice, or hand gestures.
Focal vocabulary
"Focal vocabulary" is a specialized set of terms and distinctions that is particularly important to a certain group; those with a particular focus of experience or activity. A lexicon, or vocabulary, is a language's dictionary, its set of names for things, events, and ideas. Some linguists believe that lexicon influences people's perception on things, the Sapir–Whorf hypothesis. For example, the Nuer of Sudan have an elaborate vocabulary to describe cattle. The Nuer have dozens of names for cattle because of the cattle's particular histories, economies, and environments. This kind of comparison has elicited some linguistic controversy, as with the number of "Eskimo words for snow". English speakers can also elaborate their snow and cattle vocabularies when the need arises.[4][5]
Vocabulary growth
Initially, in the infancy phase, vocabulary growth requires no effort. Infants hear words and mimic them, eventually associating them with objects and actions. This is the listening vocabulary. The speaking vocabulary follows, as a child's thoughts become more reliant on its ability to express itself without gestures and mere sounds. Once the reading and writing vocabularies are attained – through questions and education – the anomalies and irregularities of language can be discovered.
In first grade, an advantaged student (i.e. a literate student) knows about twice as many words as a disadvantaged student. Generally, this gap does not tighten. This translates into a wide range of vocabulary size by age five or six, at which time an English-speaking child will know about 2,500–5,000 words. An average student learns some 3,000 words per year, or approximately eight words per day.[6]
After leaving school, vocabulary growth reaches a plateau. People may then expand their vocabularies by engaging in activities such as reading, playing word games, and participating in vocabulary programs.
The importance of a vocabulary

An extensive vocabulary aids expressions and communication.
Vocabulary size has been directly linked to reading comprehension.[7]
Linguistic vocabulary is synonymous with thinking vocabulary.[7]
A person may be judged by others based on his or her vocabulary.

[edit] Native- and foreign-language vocabulary
[edit] Native-language vocabulary
Native speakers' vocabularies vary widely within a language, and are especially dependent on the level of the speaker's education. A 1995 study estimated the vocabulary size of college-educated speakers at about 17,000 word families[clarification needed], and that of first-year college students (high-school educated) at about 12,000.[8]
Foreign-language vocabulary
The effects of vocabulary size on language comprehension
Francis and Kucera[9] studied English texts totaling one million words and found that if one knows the words with the highest frequency, they will quickly know most of the words in an English text:
Vocabulary Size Written Text Coverage
1000 words 72.0%
2000 79.7
3000 84.0
4000 86.8
5000 88.7
6000 89.9
15,851 97.8
By knowing the 2000 English words with the highest frequency, one would know 80% of the words in those texts. The numbers look even better than this if we want to cover the words we come across in an informally spoken context.[citation needed] Then the 2000 most common words would cover 96% of the vocabulary.[10] These numbers should be encouraging to beginning language learners, especially because the numbers in the table are for word lemmas and knowing that many word families would give even higher coverage. However, the number of words needed may differ substantially between different languages.
[edit] Second Language Vocabulary Acquisition
Learning vocabulary is one of the first steps of learning a second language, yet a learner never finishes vocabulary acquisition. Whether in one’s native language or a second language, the acquisition of new vocabulary is a continual process. Many methods can help one acquire new vocabulary.
[edit] Memorization
Although memorization can be seen as tedious or boring, associating one word in the native language with the corresponding word in the second language until memorized is considered one of the best methods of vocabulary acquisition. By the time students reach adulthood, they generally have gathered a number of personalized memorization methods. Although many argue that memorization does not typically require the complex cognitive processing that increases retention (Sagarra & Alba, 2006),[11] it does typically require a large amount of repetition. Other methods typically require more time and longer to recall.
Some words cannot be easily linked through association or other methods. When a word in the second language is phonologically or visually similar to a word in the native language, one often assumes they also share similar meanings. Though this is frequently the case, it is not always true. When faced with a false cognate, memorization and repetition are the keys to mastery. If a second language learner relies solely on word associations to learn new vocabulary, that person will have a very difficult time mastering false cognates. When large amounts of vocabulary must be acquired in a limited amount of time, when the learner needs to recall information quickly, when words represent abstract concepts or are difficult to picture in a mental image, or when discriminating between false cognates, rote memorization is the method to use. A neural network model of novel word learning across orthographies, accounting for L1-specific memorization abilities of L2-learners has recently been introduced (Hadzibeganovic & Cannas, 2009).[12]
[edit] The Keyword Method
One useful method to build vocabulary in a second language is the keyword method. When additional time is available or one wants to emphasize a few key words, one can create mnemonic devices or word associations. Although these strategies tend to take longer to implement and may take longer in recollection, they create new or unusual connections that can increase retention. The keyword method requires deeper cognitive processing, thus increasing the likelihood of retention (Sagarra & Alba, 2006).[11] This method uses fits within Paivio’s (1986)[13] dual coding theory because it uses both two verbal and image memory systems. However, this method should be used only with words that represent concrete and imageable things. Abstract concepts or words that do not bring a distinct image to mind are difficult to associate. In addition, studies have shown that associative vocabulary learning is more successful with younger aged students (Sagarra & Alba, 2006).[11] As students advance and age, they tend to rely less on creating word associations to remember vocabulary.
[edit] Basic English vocabulary
Several word lists have been developed to provide people with a limited vocabulary either quick language proficiency or an effective means of communication. In 1930, Charles Kay Ogden created Basic English (850 words). Other lists include Simplified English (1000 words) and Special English (1500 words). The General Service List,[14] 2000 high frequency words compiled by Michael West from a 5,000,000 word corpus, has been used to create a number of adapted reading texts for English language learners. Knowing 2000 English words, one could understand quite a lot of English, and even read a lot of simple material without problems.
Vocabulary differences between social classes in the U.S.A.
James Flynn reports the remarkable differences in vocabulary exposure of pre-schoolers between different classes in the U.S.A. Apparently, pre-schoolers of professional families are typically exposed to 2,150 different words, pre-schoolers from working class families to 1,250 words, while those from households on welfare just 620.[15]
See also

Differences between American and British English (vocabulary)
Language proficiency (Linguistic proficiency) The ability of an individual to speak or perform in an acquired language).

[edit] Footnotes

^ Cambridge Advanced Learners Dictionary
^ Barnhart, Clarence L. (1968).
^ The World Book Dictionary. Clarence L. Barnhart. 1968 Edition. Published by Thorndike-Barnhart, Chicago, Illinois.
^ Miller (1989)
^ Lenkeit
^ "Vocabulary". Sebastian Wren, Ph.D. BalancedReading.com http://www.balancedreading.com/vocabulary.html
^ a b Stahl, Steven A. Vocabulary Development. Cambridge: Brookline Books, 1999. p. 3. "The Cognitive Foundations of Learning to Read: A Framework", Southwest Educational Development Laboratory, [1], p. 14.
^ E.B. Zechmeister, A.M. Chronis, W.L. Cull, C.A. D'Anna and N.A. Healy, Growth of a functionally important lexicon, Journal of Reading Behavior, 1995, 27(2), 201-212
^ W.N. Francis, and H. Kucera. Frequency Analysis of English Usage, Houghton Mifflin, Boston, 1982
^ Schonell, et al. 1956
^ a b c Sagarra, Nuria, & Alba, Matthew. (2006). The Key Is in the Keyword: L2 Vocabulary Learning Methods With Beginning Learners of Spanish. The Modern Language Journal, 90, ii. p. 228-243.
^ Hadzibeganovic Tarik & Cannas, Sergio A. (2009). A Tsallis' statistics based neural network model for novel word learning. Physica A, 388, pp. 732-746.
^ Paivio, A. (1986). Mental Representations: A Dual Coding Approach. New York: Oxford University Press.
^ West (1953)
^ Flynn (2008), p. 102.

[edit] References

Barnhart, Clarence Lewis (ed.) (1968). The World Book Dictionary. Chicago: Thorndike-Barnhart, OCLC 437494
Flynn, James Robert (2008). Where have all the liberals gone? : race, class, and ideals in America. Cambridge University Press; 1st edition. ISBN 978-0521494311 OCLC 231580885
Lenkeit, Roberta Edwards (2007) Introducing cultural anthropology Boston: McGraw-Hill (3rd. ed.) OCLC 64230435
Liu, Na and I.S.P. Nation. "Factors affecting guessing vocabulary in context", RELC Journal, 1985,16 1, pp. 33–42. doi:10.1177/003368828501600103
Miller, Barbara D. (1999). Cultural Anthropology(4th ed.) Boston: Allyn and Bacon, p.315 OCLC 39101950
Schonell, Sir Fred Joyce, Ivor G. Meddleton and B. A. Shaw, A study of the oral vocabulary of adults : an investigation into the spoken vocabulary of the Australian worker, University of Queensland Press, Brisbane, 1956. OCLC 606593777
West, Michael (1953). A general service list of English words, with semantic frequencies and a supplementary word-list for the writing of popular science and technology London, New York: Longman, Green OCLC 318957