aquatic plant vs water plant

aquatic plant and water plant both are nouns.

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

As nouns, aquatic plant and water plant are synonyms defined as:

aquatic plant and 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 synonyms of aquatic plant include hydrophyte, hydrophytic plant.

aquatic plant (noun)	water plant (noun)
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	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