wordbook vs vocabulary

wordbook and vocabulary both are nouns.

Word	Noun	Adjective	Verb	Adverb
wordbook	Yes	No	No	No
vocabulary	Yes	No	No	No

As nouns, vocabulary is a hyponym of wordbook; that is, vocabulary is a word with a more specific, narrower meaning than wordbook:

Other hyponyms of wordbook include dictionary, lexicon, onomasticon, gloss, glossary, synonym finder, thesaurus.

wordbook (noun)	vocabulary (noun)
a reference book containing words (usually with their meanings)	a language user's knowledge of words
	the system of techniques or symbols serving as a means of expression (as in arts or crafts)
	a listing of the words used in some enterprise