Synonyms to just plain nuts

cuckoo, Philomel, ape, balmy, bananas, barmy, bats, batty, beany, bonkers, buggy, bughouse, bugs, bulbul, cackle, call, canary, carol, caw, chatter, cheep, chirk, chirp, chirr, chirrup, chitter, chuck, clack, cluck, cock-a-doodle-doo, conformist, coo, copier, copycat, copyist, counterfeiter, crackbrain, crackbrained, cracked, crackers, crank, cranky, crazed, crazy, croak, cronk, crow, daffy, daft, ding-a-ling, dippy, dissembler, dissimulator, dotty, drum, echo, echoer, echoist, faker, feathered songster, flaky, flipped, forger, freaked-out, fruitcakey, fruity, gabble, gaga, gaggle, gobble, goofy, guggle, harebrain, haywire, honk, hoo, hoot, hypocrite, imitator, impersonator, impostor, kook, kooky, lark, loony, loopy, lunatic, mavis, mime, mimer, mimic, mimicker, mocker, mockingbird, monkey, nightingale, nut, nuts, nutty, off the hinges, off the track, off the wall, oriole, parrot, peep, phony, pip, pipe, plagiarist, poll-parrot, polly, polly-parrot, poseur, potty, quack, ringdove, roll, round the bend, scold, screwball, screwballs, screwy, sheep, simulator, sing, singing bird, slaphappy, song sparrow, songbird, songster