Ostrea vs Japanese oyster

Ostrea and Japanese oyster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ostrea	Yes	No	No	No
Japanese oyster	Yes	No	No	No

Ostrea (noun)	Japanese oyster (noun)
type genus of the family Ostreidae	a large oyster native to Japan and introduced along the Pacific coast of the United States; a candidate for introduction in Chesapeake Bay