tea vs afternoon tea

tea and afternoon tea both are nouns.

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

As nouns, tea and afternoon tea are synonyms defined as:

tea and afternoon tea: a light midafternoon meal of tea and sandwiches or cakes

Other synonyms of tea include teatime.

tea (noun)	afternoon tea (noun)
a beverage made by steeping tea leaves in water	a light midafternoon meal of tea and sandwiches or cakes
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