herbal vs herb

herbal and herb both are nouns.

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

herbal (noun)	herb (noun)
tea-like drink made of leaves of various herbs	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

herbal (adjective)	herb (adjective)
of or relating to herbs