pep pill vs stimulant

pep pill and stimulant both are nouns.

Word	Noun	Adjective	Verb	Adverb
pep pill	Yes	No	No	No
stimulant	Yes	Yes	No	No

As nouns, stimulant is a hypernym of pep pill; that is, stimulant is a word with a broader meaning than pep pill:

pep pill: a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
stimulant: a drug that temporarily quickens some vital process

Other hypernyms of pep pill include drug of abuse, street drug, excitant, stimulant drug.

pep pill (noun)	stimulant (noun)
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression	a drug that temporarily quickens some vital process
	any stimulating information or event; acts to arouse action

pep pill (adjective)	stimulant (adjective)
	that stimulates