winter heliotrope vs herb

winter heliotrope and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
winter heliotrope	Yes	No	No	No
herb	Yes	No	No	No

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

winter heliotrope: European herb with vanilla-scented white-pink flowers
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 winter heliotrope include herbaceous plant.

winter heliotrope (noun)	herb (noun)
European herb with vanilla-scented white-pink flowers	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