sea wrack vs eelgrass

sea wrack and eelgrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
sea wrack	Yes	No	No	No
eelgrass	Yes	No	No	No

As nouns, sea wrack and eelgrass are synonyms defined as:

sea wrack and eelgrass: submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts

Other synonyms of sea wrack include grass wrack, Zostera marina.

sea wrack (noun)	eelgrass (noun)
growth of marine vegetation especially of the large forms such as rockweeds and kelp	submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts
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