poop vs stool

poop and stool both are nouns.

Word	Noun	Adjective	Verb	Adverb
poop	Yes	No	No	No
stool	Yes	No	Yes	No

As nouns, stool is a hypernym of poop; that is, stool is a word with a broader meaning than poop:

Other hypernyms of poop include BM, dejection, faecal matter, faeces, fecal matter, feces, ordure.

poop (noun)	stool (noun)
the rear part of a ship	a simple seat without a back or arms
slang terms for inside information	a plumbing fixture for defecation and urination
a stupid foolish person	(forestry) the stump of a tree that has been felled or headed for the production of saplings
obscene terms for feces	solid excretory product evacuated from the bowels

poop (verb)	stool (verb)
	have a bowel movement
	grow shoots in the form of stools or tillers
	react to a decoy, of wildfowl
	lure with a stool, as of wild fowl