sheep plant vs herb

sheep plant and herb both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheep plant	Yes	No	No	No
herb	Yes	No	No	No

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

sheep plant: perennial prostrate mat-forming herb with hoary woolly foliage
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 sheep plant include herbaceous plant.

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

sheep plant: cushion-forming New Zealand herb having leaves densely covered with tawny hairs
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 sheep plant include herbaceous plant.

sheep plant (noun)	herb (noun)
perennial prostrate mat-forming herb with hoary woolly foliage	aromatic potherb used in cookery for its savory qualities
cushion-forming New Zealand herb having leaves densely covered with tawny hairs	a plant lacking a permanent woody stem; many are flowering garden plants or potherbs; some having medicinal properties; some are pests