junco vs finch

junco and finch both are nouns.

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

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

junco: small North American finch seen chiefly in winter
finch: any of numerous small songbirds with short stout bills adapted for crushing seeds

junco (noun)	finch (noun)
small North American finch seen chiefly in winter	any of numerous small songbirds with short stout bills adapted for crushing seeds