Oxyura jamaicensis vs ruddy duck

Oxyura jamaicensis and ruddy duck both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oxyura jamaicensis	Yes	No	No	No
ruddy duck	Yes	No	No	No

As nouns, Oxyura jamaicensis and ruddy duck are synonyms defined as:

Oxyura jamaicensis and ruddy duck: reddish-brown stiff-tailed duck of North America and northern South America

Oxyura jamaicensis (noun)	ruddy duck (noun)
reddish-brown stiff-tailed duck of North America and northern South America	reddish-brown stiff-tailed duck of North America and northern South America