hooded merganser vs Lophodytes cucullatus

hooded merganser and Lophodytes cucullatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
hooded merganser	Yes	No	No	No
Lophodytes cucullatus	Yes	No	No	No

As nouns, hooded merganser and Lophodytes cucullatus are synonyms defined as:

hooded merganser and Lophodytes cucullatus: small North American duck with a high circular crest on the male's head

Other synonyms of hooded merganser include hooded sheldrake.

hooded merganser (noun)	Lophodytes cucullatus (noun)
small North American duck with a high circular crest on the male's head	small North American duck with a high circular crest on the male's head