Synonyms in the same form
Noun plural
Simpleton
simpletons, idiots, asses, imbeciles, dolts, buffoons, oafs, ignoramuses, dullards, dunces, stupids, clowns, morons, ninnies, dimwits, nitwits, twits, lunatics, retards, dummies, loons, dopes
Jester
jesters, jokers, jack-puddings, merry-andrews, drolls, harlequins, pickle-herrings
Other
jack-asses, put-ons, dumb-bells, trifles, plays, tools, dogs, pin-heads