WordNet (r) 3.0 (2006):

blooper
    n 1: an embarrassing mistake [syn: blunder, blooper,
         bloomer, bungle, pratfall, foul-up, fuckup,
         flub, botch, boner, boo-boo]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "blooper":
   bloomer, blunder, bobble, bonehead play, boner, boo-boo,
   boob stunt, boot, break, bull, bungle, dumb trick, faux, fluff,
   fool mistake, foozle, foul-up, gaffe, goof, howler, impropriety,
   indecorum, lapse, louse-up, mistake, muck-up, pratfall, screamer,
   screw-up, slip, solecism, trip