African tea vs excitant

African tea and excitant both are nouns.

Word	Noun	Adjective	Verb	Adverb
African tea	Yes	No	No	No
excitant	Yes	Yes	No	No

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

African tea: the leaves of the shrub Catha edulis which are chewed like tobacco or used to make tea; has the effect of a euphoric stimulant
excitant: a drug that temporarily quickens some vital process

Other hypernyms of African tea include stimulant, stimulant drug.

African tea (noun)	excitant (noun)
the leaves of the shrub Catha edulis which are chewed like tobacco or used to make tea; has the effect of a euphoric stimulant	a drug that temporarily quickens some vital process

African tea (adjective)	excitant (adjective)
	(of drugs e.g.) able to excite or stimulate