Carpodacus mexicanus vs finch

Carpodacus mexicanus and finch both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carpodacus mexicanus	Yes	No	No	No
finch	Yes	No	No	No

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

Carpodacus mexicanus: small finch originally of the western United States and Mexico
finch: any of numerous small songbirds with short stout bills adapted for crushing seeds

Carpodacus mexicanus (noun)	finch (noun)
small finch originally of the western United States and Mexico	any of numerous small songbirds with short stout bills adapted for crushing seeds