milk of magnesia vs cathartic

milk of magnesia and cathartic both are nouns.

Word	Noun	Adjective	Verb	Adverb
milk of magnesia	Yes	No	No	No
cathartic	Yes	Yes	No	No

As nouns, cathartic is a hypernym of milk of magnesia; that is, cathartic is a word with a broader meaning than milk of magnesia:

milk of magnesia: purgative consisting of a milky white liquid suspension of magnesium hydroxide; used as a laxative and (in smaller doses) as an antacid
cathartic: a purging medicine; stimulates evacuation of the bowels

Other hypernyms of milk of magnesia include aperient, physic, purgative.

milk of magnesia (noun)	cathartic (noun)
purgative consisting of a milky white liquid suspension of magnesium hydroxide; used as a laxative and (in smaller doses) as an antacid	a purging medicine; stimulates evacuation of the bowels

milk of magnesia (adjective)	cathartic (adjective)
	emotionally purging (of e.g. art)
	strongly laxative
	emotionally purging