tape grass vs hydrophytic plant

tape grass and hydrophytic plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
tape grass	Yes	No	No	No
hydrophytic plant	Yes	No	No	No

As nouns, hydrophytic plant is a hypernym of tape grass; that is, hydrophytic plant is a word with a broader meaning than tape grass:

tape grass: submerged aquatic plant with ribbonlike leaves; Old World and Australia
hydrophytic plant: 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 tape grass include aquatic plant, hydrophyte, water plant.

tape grass (noun)	hydrophytic plant (noun)
submerged aquatic plant with ribbonlike leaves; Old World and Australia	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