29 Moby Thesaurus words for "secret language": Aesopian language, Babel, Greek, argot, babble, cant, cipher, code, coded message, cryptoanalysis, cryptoanalytics, cryptogram, cryptograph, cryptographer, cryptography, double Dutch, garble, gibberish, gift of tongues, glossolalia, gobbledygook, invisible ink, jargon, jumble, noise, scramble, secret writing, slang, sympathetic ink