arrow arum vs aquatic plant

arrow arum and aquatic plant both are nouns.

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

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

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

arrow arum (noun)	aquatic 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