Aesopian language, Babel, Greek, Washingtonese, absurdity, amphigory, argot, babble, babblement, balderdash, bibble-babble, blabber, blather, bombast, bombastry, bull, bunkum, cant, cipher, claptrap, code, cryptogram, double Dutch, double-talk, drivel, drool, federalese, fiddle-faddle, fiddledeedee, flummery, folderol, fudge, fustian, gabble, galimatias, gammon, garbage, garble, gibber, gibberish, gibble-gabble, gift of tongues, glossolalia, highfalutin, hocus-pocus, hot air, humbug, jabber, jabberwocky, jargon, jumble, lingo, malarkey, mumbo jumbo, narrishkeit, niaiserie, noise, nonsense, official jargon, officialese, pack of nonsense, palaver, patois, patter, phraseology, political doubletalk, poppycock, prate, prattle, pussyfooting, rant, rigamarole, rigmarole, rodomontade, rubbish, scatology, scramble, secret language, skimble-skamble, slang, stuff and nonsense, stultiloquence, taboo language, trash, trumpery, twaddle, twattle, twiddle-twaddle, vaporing, vernacular, vocabulary, vulgar language, waffling

For further exploring for "gobbledygook" in Webster Dictionary Online