pipsissewa vs herb

pipsissewa and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
pipsissewa	Yes	No	No	No
herb	Yes	No	No	No

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

pipsissewa: any of several plants of the genus Chimaphila
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 pipsissewa include herbaceous plant.

pipsissewa (noun)	herb (noun)
any of several plants of the genus Chimaphila	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