wild celery vs herbaceous plant

wild celery and herbaceous plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild celery	Yes	No	No	No
herbaceous plant	Yes	No	No	No

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

wild celery: herb of Europe and temperate Asia
herbaceous plant: a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests

Other hypernyms of wild celery include herb.

wild celery (noun)	herbaceous plant (noun)
submerged aquatic plant with ribbonlike leaves; Old World and Australia	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests
herb of Europe and temperate Asia