Aesopian language
Babel
Greek
babble
cant
cipher
code
cryptogram
dialect
double Dutch
flash
garble
gibberish
gift of tongues
glossolalia
gobbledygook
jargon
jumble
lingo
mumbo jumbo
noise
patois
patter
phraseology
scatology
scramble
secret language
slang
taboo language
vernacular
vocabulary
vulgar language
non-standard speech
rhyming slang
street name
cryptology
daylight
indirection
jinx
sword-stroke
target