featherfoil vs aquatic plant

featherfoil and aquatic plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
featherfoil	Yes	No	No	No
aquatic plant	Yes	No	No	No

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

featherfoil: a plant of the genus Hottonia
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 featherfoil include hydrophyte, hydrophytic plant, water plant.

featherfoil (noun)	aquatic plant (noun)
a plant of the genus Hottonia	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