tea vs beverage

tea and beverage both are nouns.

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

As nouns, beverage is a hypernym of tea; that is, beverage is a word with a broader meaning than tea:

Other hypernyms of tea include drink, drinkable, potable.

tea (noun)	beverage (noun)
a beverage made by steeping tea leaves in water	any liquid suitable for drinking
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