Venus vs Venus mercenaria

Venus and Venus mercenaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
Venus	Yes	No	No	No
Venus mercenaria	Yes	No	No	No

Venus (noun)	Venus mercenaria (noun)
type genus of the family Veneridae: genus of edible clams with thick oval shells	an edible American clam; the heavy shells were used as money by some American Indians
the second nearest planet to the sun; it is peculiar in that its rotation is slow and retrograde (in the opposite sense of the Earth and all other planets except Uranus); it is visible from Earth as an early `morning star' or an `evening star'
goddess of love; counterpart of Greek Aphrodite