pochard vs Aythya ferina

pochard and Aythya ferina both are nouns.

Word	Noun	Adjective	Verb	Adverb
pochard	Yes	No	No	No
Aythya ferina	Yes	No	No	No

As nouns, pochard and Aythya ferina are synonyms defined as:

pochard and Aythya ferina: heavy-bodied Old World diving duck having a grey-and-black body and reddish head

pochard (noun)	Aythya ferina (noun)
heavy-bodied Old World diving duck having a grey-and-black body and reddish head	heavy-bodied Old World diving duck having a grey-and-black body and reddish head