Carduelis hornemanni vs redpoll

Carduelis hornemanni and redpoll both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carduelis hornemanni	Yes	No	No	No
redpoll	Yes	No	No	No

As nouns, Carduelis hornemanni and redpoll are synonyms defined as:

Carduelis hornemanni and redpoll: small siskin-like finch with a red crown

Carduelis hornemanni (noun)	redpoll (noun)
small siskin-like finch with a red crown	small siskin-like finch with a red crown and a rosy breast and rump
	small siskin-like finch with a red crown