Vocabulary knowledge is a crucial factor across the whole spectrum language activities because it is the underlying factors for the other aspects of language. For example words are constituent elements of a sentence and the knowledge of word meaning enables the learner to form error-free sentence.
MEANING OF VOCABULARY
Vocabulary is the total number of words in a language. It could also mean the total number of words known to a language user. Thus, we have two types of vocabulary namely: ACTIVE and PASSIVE vocabulary
Active vocabulary: are those words the language user often uses in speech or writing.
Passive vocabulary: are those words we recognize when reading and listening but they rarely occur in our speech or writing.