amphetamine sulfate vs pep pill

amphetamine sulfate and pep pill both are nouns.

Word	Noun	Adjective	Verb	Adverb
amphetamine sulfate	Yes	No	No	No
pep pill	Yes	No	No	No

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

amphetamine sulfate: a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system
pep pill: a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression

Other hypernyms of amphetamine sulfate include amphetamine, speed, upper.

amphetamine sulfate (noun)	pep pill (noun)
a sulfate derivative of amphetamine that is used as a stimulant for the central nervous system	a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression