water speedwell vs hydrophyte

water speedwell and hydrophyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
water speedwell	Yes	No	No	No
hydrophyte	Yes	No	No	No

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

water speedwell: plant of wet places in Eurasia and America
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 water speedwell include aquatic plant, hydrophytic plant, water plant.

water speedwell (noun)	hydrophyte (noun)
plant of wet places in Eurasia and America	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