secretiveness, n. taciturnity, [reserve], [silence], uncommunicativeness, wariness.
secret language. cryptology, argot, [flash].
secret name. cryptonym.
secrets, n. pl. confidences, mysteries; arcana, penetralia.
secret science. esoterics, cabala.
secret vice. [masturbation], onanism, [self-abuse].
secret writing. cryptography, [cipher], steganography, cryptogram.
sect, n. [school], [party], denomination.
sectarian, a. denominational.
section, n. [portion], [part], [division], [segment], [piece]; paragraph.