30 entries under noun topic. ×
| intricacy(question, puzzle, conundrum, enigma) | |
| mind-boggler(question, puzzle, conundrum, enigma) | |
| nut(challenge, case, matter, knot) | |
| obstacle(trouble, issue, doubt, question) | |
| puzzler(question, puzzle, conundrum, enigma) | |
| stumper(question, puzzle, conundrum, enigma) | |
| twister(question, puzzle, conundrum, enigma) | |
| division(separation, disconnection, singularity) | |
| complex situation(hard situation, expression, tough, problem) | |
| sticking-point(hard, difficulty, problem, predicament) |
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