| burden(noun, trouble, concern, point, difficulty) |
| catch(noun, difficulty, weakness, failing, hindrance) |
| cryptogram(noun, difficulty, question, secret, puzzle) |
| difficult(adjective, hard, tough, grim, demanding) |
| drawback(noun, trouble, difficulty, weakness, bar) |
| hassle(noun, trouble, bother, defeat, difficulty) |
| mystification(noun, trouble, challenge, question, secret) |
| obstruction(noun, check, delay, stay, difficulty) |
| scrape(noun, fix, worry, difficulty, distress) |
| task(noun, activity, study, work, worry) |
| vexation(noun, trouble, bother, worry, concern) |
| job(noun, trouble, worry, difficulty) |
| inconvenience(noun, trouble, bother, worry, strain) |
| annoyance(noun, trouble, bother, worry, concern) |
| argument(noun, trouble, bother, concern, dispute) |
| cipher(noun, secret) |
| code(noun, secret) |
| conflict(noun, dispute, difficulty, issue, disagreement) |
| count(noun, difficulty, informal, issue, mess) |
| disadvantage(noun, difficulty, weakness, negative, bug) |