mud plantain vs aquatic plant

mud plantain and aquatic plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
mud plantain	Yes	No	No	No
aquatic plant	Yes	No	No	No

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

mud plantain: grassy-leaved North American aquatic plant with yellow star-shaped blossoms
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 mud plantain include hydrophyte, hydrophytic plant, water plant.

mud plantain (noun)	aquatic plant (noun)
grassy-leaved North American aquatic plant with yellow star-shaped blossoms	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