This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of stool.

"Doctors and nurses often use the term stools when talking about your baby’s BMs or poop."

window stool   

stooled    stooling    stools   

respond    react    stump    tree stump    acquire    get    grow    develop    produce    tempt   

excrement    folding stool    window-stool    to stool turfs    office stool    back-stool    to fall between two stools    stool of repentance    chair    seat   

stool pigeon    stoolie    footstool   

ramfy    bishop-stool    footstool    decoy    defecate    feces   

Abdul    Boole    Dzhambul    Istanbul    Jewel    Joule    Poole    Rahul    Raul    Yule   

armchair    bench    sofa    chair    furniture    desk    cot    cabinet    cushion    shelve