muck vs stool

muck and stool both are nouns.

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

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

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

muck (noun)	stool (noun)
any thick, viscous matter	a simple seat without a back or arms
fecal matter of animals	a plumbing fixture for defecation and urination
	(forestry) the stump of a tree that has been felled or headed for the production of saplings
	solid excretory product evacuated from the bowels

muck (verb)	stool (verb)
remove muck, clear away muck, as in a mine	have a bowel movement
soil with mud, muck, or mire	grow shoots in the form of stools or tillers
spread manure, as for fertilization	react to a decoy, of wildfowl
	lure with a stool, as of wild fowl