Crossword puzzle clue "whoopee cushions"

MATTRESS, a large pad filled with resilient material used on or as a bed

GLUTEUS, (Greek) a buttock muscle, also GLUTAEUS

GLUTE, any of the three large muscles of the buttocks, also GLUTAEUS

HASSOCK, a kneeling cushion in a church

HOVERCRAFT, a vehicle that is able to travel across both land and water on a cushion of air

INSOLE, the inner sole of a shoe or boot