From Moby Thesaurus II by Grady Ward, 1.0 :
125 Moby Thesaurus words for "nonsense":
Greek, absurdity, absurdness, amphigory, antics, applesauce,
babble, babblement, balderdash, baloney, bibble-babble, bilge,
blabber, blah, blather, blatherskite, blether, bombast, bosh,
buffoonery, bull, bullshit, bunk, bunkum, bushwa, cackle, capering,
claptrap, cock, crap, double Dutch, double-talk, drip, drivel,
drool, eyewash, fantasticalness, fiddle-faddle, fiddledeedee,
flapdoodle, flimflam, flummery, folderol, foolishness, frivolity,
fudge, fustian, gabble, galimatias, gammon, garbage, gas, gibber,
gibberish, gibble-gabble, gobbledygook, gook, guff, hocus-pocus,
hogwash, hokum, hooey, horsefeathers, horseplay, hot air, humbug,
inanity, jabber, jabberwocky, jargon, jazz, jesting,
jiggery-pokery, jokes, joking, ludicrousness, malarkey, mischief,
monkey business, monkeyshines, monstrousness, moonshine,
mumbo jumbo, mumbo-jumbo, narrishkeit, niaiserie, nonsensicality,
outrageousness, pack of nonsense, palaver, piffle, poppycock,
pranks, prate, prattle, preposterousness, puffery, punk, rant,
ridiculousness, rigamarole, rigmarole, rodomontade, rot, rubbish,
shenanigans, shit, silliness, skimble-skamble, stuff and nonsense,
stultiloquence, tomfoolery, tommyrot, trash, tricks, tripe,
trumpery, twaddle, twattle, twiddle-twaddle, vaporing, waffle,
waffling, waggishness, wildness