tea vs cupper

tea and cupper both are nouns.

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

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

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

tea (noun)	cupper (noun)
a beverage made by steeping tea leaves in water	a cup of tea
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