methylphenidate vs excitant

methylphenidate and excitant both are nouns.

Word	Noun	Adjective	Verb	Adverb
methylphenidate	Yes	No	No	No
excitant	Yes	Yes	No	No

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

methylphenidate: central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children
excitant: a drug that temporarily quickens some vital process

Other hypernyms of methylphenidate include stimulant, stimulant drug.

methylphenidate (noun)	excitant (noun)
central nervous system stimulant (trade name Ritalin) used in the treatment of narcolepsy in adults and attention deficit disorder in children	a drug that temporarily quickens some vital process

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