wordbook vs glossary

wordbook and glossary both are nouns.

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

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

wordbook: a reference book containing words (usually with their meanings)
glossary: an alphabetical list of technical terms in some specialized field of knowledge; usually published as an appendix to a text on that field

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

wordbook (noun)	glossary (noun)
a reference book containing words (usually with their meanings)	an alphabetical list of technical terms in some specialized field of knowledge; usually published as an appendix to a text on that field