Pistia stratiotes vs hydrophyte

Pistia stratiotes and hydrophyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pistia stratiotes	Yes	No	No	No
hydrophyte	Yes	No	No	No

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

Pistia stratiotes: pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes
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 Pistia stratiotes include aquatic plant, hydrophytic plant, water plant.

Pistia stratiotes (noun)	hydrophyte (noun)
pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes	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