Synonyms of rebus

1 Syllable
sphinx, why, rune, crux
2 Syllables
thrillers, thriller, stumper, twister, poser, stumpers, question, teasers, stickler, sphinxes, occult, teaser, puzzler, chiller, sphinges, puzzlers, riddle, grabber, problem, riddling, chillers
3 Syllables
cryptogram, mystery, enigma, whodunit, brainteaser, braintwister, mindboggler, mysteries, puzzlement, conundrum, charade, oracle, brain-twister, secrecy, subtlety, cliffhanger
4 Syllables
perplexity, abstruseness, difficulty, perplexities
5 Syllables
abstrusenesses, inscrutableness, mystification
6 Syllables
inscrutability