Epsom salts vs physic

Epsom salts and physic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Epsom salts	Yes	No	No	No
physic	Yes	No	No	No

As nouns, physic is a hypernym of Epsom salts; that is, physic is a word with a broader meaning than Epsom salts:

Epsom salts: (used with a singular noun) hydrated magnesium sulfate used as a laxative
physic: a purging medicine; stimulates evacuation of the bowels

Other hypernyms of Epsom salts include aperient, cathartic, purgative.

Epsom salts (noun)	physic (noun)
(used with a singular noun) hydrated magnesium sulfate used as a laxative	a purging medicine; stimulates evacuation of the bowels
hydrated magnesium sulfate that is taken orally to treat heartburn and constipation and injected to prevent seizures