herbal vs tea

herbal and tea both are nouns.

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

As nouns, tea is a hypernym of herbal; that is, tea is a word with a broader meaning than herbal:

herbal (noun)	tea (noun)
tea-like drink made of leaves of various herbs	a beverage made by steeping tea leaves in water
	a light midafternoon meal of tea and sandwiches or cakes
	dried leaves of the tea shrub; used to make tea
	a tropical evergreen shrub or small tree extensively cultivated in e.g. China and Japan and India; source of tea leaves

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