herb tea vs sage tea

herb tea and sage tea both are nouns.

Word	Noun	Adjective	Verb	Adverb
herb tea	Yes	No	No	No
sage tea	Yes	No	No	No

As nouns, sage tea is a hyponym of herb tea; that is, sage tea is a word with a more specific, narrower meaning than herb tea:

Other hyponyms of herb tea include tisane, dill tea, tea essence.

herb tea (noun)	sage tea (noun)
tea-like drink made of leaves of various herbs	a beverage prepared by infusion of sage leaves.