stool vs ottoman

stool and ottoman both are nouns.

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

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

stool (noun)	ottoman (noun)
a simple seat without a back or arms	thick cushion used as a seat
a plumbing fixture for defecation and urination	a low seat or a stool to rest the feet of a seated person
(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)	ottoman (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