Lutra vs genus Lutra

Lutra and genus Lutra both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lutra	Yes	No	No	No
genus Lutra	Yes	No	No	No

As nouns, Lutra and genus Lutra are synonyms defined as:

Lutra and genus Lutra: in some classifications considered a genus of the subfamily Lutrinae

Lutra (noun)	genus Lutra (noun)
in some classifications considered a genus of the subfamily Lutrinae	in some classifications considered a genus of the subfamily Lutrinae