noun
BAD : The pillows had been removed from the sofa and scattered on the floor.
GOOD : The cushions had been removed from the sofa and scattered on the floor.
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pillow = a bag-like object filled with soft material that you rest your head on when you are in bed: 'No sooner had his head touched the pillow than he was sound asleep.'
cushion = a bag-like object filled with soft material that you put on a chair, sofa etc to make it more comfortable: 'Would you like a cushion for your back?'