| main criterion(expression, reason, importance, significance) |
| main culprit(expression, reason, importance, significance) |
| main point |
| main reason(expression, reason, importance, significance) |
| main thing |
| major asset(expression, reason, importance, significance) |
| major cause(expression, reason, importance, significance) |
| major concern(expression, reason, importance, significance) |
| major premise(expression, reason, importance, significance) |
| major reason(expression, reason, importance, significance) |
| major term(expression, reason, importance, significance) |
| master factor(expression, reason, importance, significance) |
| material point |
| maximum(peak, height, culmination, pinnacle, capstone) |
| meat |
| mess(noun, trouble, change, difficulty, situation) |
| ne plus ultra(expression, idiom, peak, height, culmination) |
| necessity(noun, trouble, change, fix, pass) |
| need(fix, pass, distress, demand, necessity) |
| needfulness(fix, pass, distress, demand, need) |