redpoll vs Carduelis hornemanni

redpoll and Carduelis hornemanni both are nouns.

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

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

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

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