stool vs excrete

stool is a noun but excrete is not a noun.

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

As verbs, excrete is a hypernym of stool; that is, excrete is a word with a broader meaning than stool:

Other hypernyms of stool include egest, eliminate, pass.

stool (noun)	excrete (noun)
a simple seat without a back or arms
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

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