wild celery vs hydrophyte

wild celery and hydrophyte both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild celery	Yes	No	No	No
hydrophyte	Yes	No	No	No

As nouns, hydrophyte is a hypernym of wild celery; that is, hydrophyte is a word with a broader meaning than wild celery:

wild celery: submerged aquatic plant with ribbonlike leaves; Old World and Australia
hydrophyte: 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 wild celery include aquatic plant, hydrophytic plant, water plant.

wild celery (noun)	hydrophyte (noun)
submerged aquatic plant with ribbonlike leaves; Old World and Australia	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
herb of Europe and temperate Asia