Mergus albellus vs smew

Mergus albellus and smew both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mergus albellus	Yes	No	No	No
smew	Yes	No	No	No

As nouns, Mergus albellus and smew are synonyms defined as:

Mergus albellus and smew: smallest merganser and most expert diver; found in northern Eurasia

Mergus albellus (noun)	smew (noun)
smallest merganser and most expert diver; found in northern Eurasia	smallest merganser and most expert diver; found in northern Eurasia