Arabian tea vs excitant

Arabian tea and excitant both are nouns.

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

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

Arabian 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 Arabian tea include stimulant, stimulant drug.

Arabian 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

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