Synonyms and related words :
Chinese puzzle, Gordian knot, Rube Goldberg contraption, action, can of worms, clockworks, complex, drive train, gear, innards, jungle, knot, labyrinth, machinery, maze, meander, mechanism, mesh, mess, motion, movement, movements, perplex, power train, ravel, servomechanism, snafu, snake pit, snarl, tangle, tangled skein, watchworks, webwork, wheels, wilderness, workings, works