waterweed vs hydrophyte

waterweed and hydrophyte both are nouns.

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

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

waterweed: a weedy aquatic plant of genus Elodea
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 waterweed include aquatic plant, hydrophytic plant, water plant.

waterweed (noun)	hydrophyte (noun)
a weedy aquatic plant of genus Elodea	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