Limnodium spongia vs hydrophyte

Limnodium spongia and hydrophyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
Limnodium spongia	Yes	No	No	No
hydrophyte	Yes	No	No	No

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

Limnodium spongia: American plant with roundish heart-shaped or kidney-shaped leaves; usually rooted in muddy bottoms of ponds and ditches
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 Limnodium spongia include aquatic plant, hydrophytic plant, water plant.

Limnodium spongia (noun)	hydrophyte (noun)
American plant with roundish heart-shaped or kidney-shaped leaves; usually rooted in muddy bottoms of ponds and ditches	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