wordbook vs gloss

wordbook and gloss both are nouns.

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

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

wordbook: a reference book containing words (usually with their meanings)
gloss: 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, glossary, synonym finder, thesaurus.

wordbook (noun)	gloss (noun)
a reference book containing words (usually with their meanings)	the property of being smooth and shiny
	an outward or token appearance or form that is deliberately misleading
	an explanation or definition of an obscure word in a text
	an alphabetical list of technical terms in some specialized field of knowledge; usually published as an appendix to a text on that field

wordbook (verb)	gloss (verb)
	provide an interlinear translation of a word or phrase
	provide interlinear explanations for words or phrases
	give a deceptive explanation or excuse for
	give a shine or gloss to, usually by rubbing