stool vs footrest

stool and footrest both are nouns.

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

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

stool (noun)	footrest (noun)
a simple seat without a back or arms	a low seat or a stool to rest the feet of a seated person
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)	footrest (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