wild ginger vs herb

wild ginger and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
wild ginger	Yes	No	No	No
herb	Yes	No	No	No

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

wild ginger: low-growing perennial herb with pungent gingery leaves and rhizomes
herb: 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 ginger include herbaceous plant.

wild ginger (noun)	herb (noun)
low-growing perennial herb with pungent gingery leaves and rhizomes	aromatic potherb used in cookery for its savory qualities
	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests