eelgrass vs sea wrack

eelgrass and sea wrack both are nouns.

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

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

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

Other synonyms of eelgrass include grass wrack, Zostera marina.

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