canary vs finch

canary and finch both are nouns.

Word	Noun	Adjective	Verb	Adverb
canary	Yes	Yes	No	No
finch	Yes	No	No	No

As nouns, finch is a hypernym of canary; that is, finch is a word with a broader meaning than canary:

canary: any of several small Old World finches
finch: any of numerous small songbirds with short stout bills adapted for crushing seeds

canary (noun)	finch (noun)
any of several small Old World finches	any of numerous small songbirds with short stout bills adapted for crushing seeds
a moderate yellow with a greenish tinge
a female singer
someone acting as an informer or decoy for the police

canary (adjective)	finch (adjective)
having the color of a canary; of a light to moderate yellow