tea vs ice tea

tea and ice tea both are nouns.

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

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

Other hyponyms of tea include cambric tea, cuppa, cupper, herb tea, herbal, herbal tea, iced tea, sun tea, white tea.

tea (noun)	ice tea (noun)
a beverage made by steeping tea leaves in water	strong tea served over ice
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