| difficulty(noun, trouble, fix, bother, worry) |
| enigma(noun, trouble, difficulty, issue, challenge) |
| dilemma(noun, trouble, fix, worry, difficulty) |
| issue(noun, trouble, worry, easy, dispute) |
| trouble(noun, fix, bother, defeat, worry) |
| conundrum(noun, trouble, difficulty, challenge, question) |
| question(noun, trouble, worry, concern, easy) |
| riddle(noun, trouble, difficulty, challenge, question) |
| puzzle(noun, trouble, worry, concern, point) |
| mystery(noun, trouble, difficulty, issue, challenge) |
| obstacle(noun, trouble, check, delay, difficulty) |
| predicament(noun, trouble, fix, disorder, worry) |
| poser(noun, trouble, difficulty, challenge, question) |
| quandary(noun, trouble, fix, difficulty, anxiety) |
| exercitation |
| query(noun, anxiety, challenge, demand, request) |
| snag(noun, trouble, difficulty, weakness, bar) |
| complication(noun, trouble, worry, difficulty, question) |
| matter(noun, trouble, worry, concern, point) |
| glitch(noun, delay, difficulty, weakness, fault) |