Vallisneria spiralis vs eelgrass

Vallisneria spiralis and eelgrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vallisneria spiralis	Yes	No	No	No
eelgrass	Yes	No	No	No

As nouns, Vallisneria spiralis and eelgrass are synonyms defined as:

Vallisneria spiralis and eelgrass: submerged aquatic plant with ribbonlike leaves; Old World and Australia

Other synonyms of Vallisneria spiralis include tape grass, wild celery.

Vallisneria spiralis (noun)	eelgrass (noun)
submerged aquatic plant with ribbonlike leaves; Old World and Australia	submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts
	submerged aquatic plant with ribbonlike leaves; Old World and Australia