stool vs shit

stool and shit both are nouns.

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

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

As verbs, stool and shit are synonyms defined as:

Other synonyms of stool include ca-ca, crap, defecate, make, take a crap, take a shit.

stool (noun)	shit (noun)
a simple seat without a back or arms	something of little value
a plumbing fixture for defecation and urination	Obscene word for unacceptable behavior
(forestry) the stump of a tree that has been felled or headed for the production of saplings	insulting terms of address for people who are stupid or irritating or ridiculous
solid excretory product evacuated from the bowels	a coarse term for defecation
	a small worthless amount
	obscene terms for feces

stool (verb)	shit (verb)
have a bowel movement	have a bowel movement
grow shoots in the form of stools or tillers	give away information about somebody
react to a decoy, of wildfowl
lure with a stool, as of wild fowl