The correct answer is probably: There is no kanji with meaning of "vocabulary". The kanji closest in meaning might be 語 I guess. :P
The two words given so far both mean vocabulary. These two words aren't identical to eachother though and have slightly different usages. Which one you want depends on which usage you mean:
単語 (単 'single' + 語 'words/language') is used more to mean individual unique vocabulary words.
語彙 (語 'words/language' + 彙 'compile/assemble') means more like "lexicon". This refers to vocabulary collectively, like the entire list of vocabulary words existing within a language, or like the full repetoire of words an individual person has at their disposal.
Could have checked the online English-Japanese dictionary - 単語林
http://www.tangorin.com , which even has a Japanese word for "vocabulary" making up part of its name! :D
December 2, 2014 at 12:57pm