mud plantain vs water plant

mud plantain and water plant both are nouns.

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

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

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

mud plantain (noun)	water 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