Rochelle powder vs physic

Rochelle powder and physic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rochelle powder	Yes	No	No	No
physic	Yes	No	No	No

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

Rochelle powder: an effervescing salt containing sodium bicarbonate and Rochelle salt and tartaric acid; used as a cathartic
physic: a purging medicine; stimulates evacuation of the bowels

Other hypernyms of Rochelle powder include aperient, cathartic, purgative.

Rochelle powder (noun)	physic (noun)
an effervescing salt containing sodium bicarbonate and Rochelle salt and tartaric acid; used as a cathartic	a purging medicine; stimulates evacuation of the bowels