pistia vs hydrophytic plant

pistia and hydrophytic plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
pistia	Yes	No	No	No
hydrophytic plant	Yes	No	No	No

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

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

pistia (noun)	hydrophytic plant (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