| question(difficulty, secret, puzzle, obscurity, knot) |
| rebus(difficulty, question, secret, puzzle, obscurity) |
| relation(report, account, novel, news, tale) |
| report(noun, account, novel, news, tale) |
| riddle(noun, difficulty, question, secret, puzzle) |
| romance(report, account, news, tale, narrative) |
| rune(difficulty, question, secret, puzzle, obscurity) |
| saga(report, account, novel, news, tale) |
| scoop(report, account, novel, news, tale) |
| secrecy(difficulty, question, secret, puzzle, obscurity) |
| secret(question, problem, puzzle, obscurity, knot) |
| sequel(report, account, novel, news, tale) |
| serial(report, account, novel, news, tale) |
| sixty-four-thousand-dollar question(expression, difficulty, question, secret, puzzle) |
| something suspenseful(expression, thriller) |
| sphinx(difficulty, question, secret, puzzle, knot) |
| spiel(report, account, novel, news, tale) |
| stickler(difficulty, question, secret, puzzle, knot) |
| stumper(difficulty, question, secret, puzzle, knot) |
| subtlety(difficulty, question, secret, puzzle, obscurity) |