Foolishness rhymes with:
bullishness, bearishness, boorishness, bullishness, jewishness, selfishness, skittishness, sluggishness, squeamishness, waterishness
Foolishness sounds like:
falcons, feliciano's, felkins, filkins, flagging, flaking, flashguns, flashing, fleecing, flexing, flicking, flocking, flogging, flushing, fulgencio