tea vs white tea

tea and white tea both are nouns.

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

As nouns, white tea is a hyponym of tea; that is, white 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, ice tea, iced tea, sun tea.

tea (noun)	white tea (noun)
a beverage made by steeping tea leaves in water	a beverage brewed from lightly oxidized tea leaves.
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