stool vs poop

stool and poop both are nouns.

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

As nouns, poop is a hyponym of stool; that is, poop is a word with a more specific, narrower meaning than stool:

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

stool (verb)	poop (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