arrow arum vs hydrophytic plant

arrow arum and hydrophytic plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
arrow arum	Yes	No	No	No
hydrophytic plant	Yes	No	No	No

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

arrow arum: an aquatic plant of the genus Peltandra; North America
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 arrow arum include aquatic plant, hydrophyte, water plant.

arrow arum (noun)	hydrophytic plant (noun)
an aquatic plant of the genus Peltandra; North 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