herbal tea vs tisane

herbal tea and tisane both are nouns.

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

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

Other hyponyms of herbal tea include sage tea, dill tea, tea essence.

herbal tea (noun)	tisane (noun)
tea-like drink made of leaves of various herbs	infusion of e.g. dried or fresh flowers or leaves