eelgrass vs hydrophyte

eelgrass and hydrophyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
eelgrass	Yes	No	No	No
hydrophyte	Yes	No	No	No

As nouns, hydrophyte is a hypernym of eelgrass; that is, hydrophyte is a word with a broader meaning than eelgrass:

eelgrass: submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts
hydrophyte: a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth

Other hypernyms of eelgrass include aquatic plant, hydrophytic plant, water plant.

As nouns, hydrophyte is a hypernym of eelgrass; that is, hydrophyte is a word with a broader meaning than eelgrass:

eelgrass: submerged aquatic plant with ribbonlike leaves; Old World and Australia
hydrophyte: a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth

Other hypernyms of eelgrass include aquatic plant, hydrophytic plant, water plant.

eelgrass (noun)	hydrophyte (noun)
submerged marine plant with very long narrow leaves found in abundance along North Atlantic coasts	a plant that grows partly or wholly in water whether rooted in the mud, as a lotus, or floating without anchorage, as the water hyacinth
submerged aquatic plant with ribbonlike leaves; Old World and Australia