| Certain math instructor | 23 |
| Certain math number | 19 |
| Certain math sign | 17 |
| Certain math units | 18 |
| Certain mathematical planes | 27 |
| Certain mathematicians | 22 |
| Certain mattress embroidery | 27 |
| Certain MDs | 11 |
| Certain means of communication | 30 |
| Certain means: Abbr. | 20 |
| Certain measured dose | 21 |
| Certain measurement | 19 |
| Certain measurement: Abbr. | 26 |
| Certain measurements | 20 |
| Certain mechanic | 16 |
| Certain med. reading | 20 |
| Certain med. test | 17 |
| Certain medalist | 16 |
| Certain mediators | 17 |
| Certain medical facility | 24 |
| Certain medical plans: Abbr. | 28 |
| Certain medical student | 23 |
| Certain medical symptoms | 24 |
| Certain medical test | 20 |
| Certain medics: Abbr. | 21 |
| Certain medieval combatant | 26 |
| Certain medieval tales | 22 |
| Certain meditator | 17 |
| Certain meeting | 15 |
| Certain meeting leader | 22 |
| Certain melon | 13 |
| Certain member of an Islamic people | 35 |
| Certain member of the Slavic people | 35 |
| Certain member of the wind section | 34 |
| Certain members of Indian royalty | 33 |
| Certain memorial tattoo | 23 |
| Certain men at eve | 18 |
| Certain menagerie | 17 |
| Certain Mennonites | 18 |
| Certain mental construct | 24 |
| Certain mentality | 17 |
| Certain mercenary | 17 |
| Certain merchant | 16 |
| Certain merganser | 17 |
| Certain mergansers | 18 |
| Certain mesons | 14 |
| Certain messages | 16 |
| Certain messaging device | 24 |
| Certain Met supporters | 22 |
| Certain metal alloy | 19 |
| Certain metal beam | 18 |
| Certain metal fastener | 22 |
| Certain metal workers | 21 |
| Certain metallic color | 22 |
| Certain metalworker | 19 |
| Certain metalworkers | 20 |
| Certain meter reader | 20 |
| Certain method of perception | 28 |
| Certain metrical foot | 21 |
| Certain Mexican-American | 24 |
| Certain Miamian | 15 |
| Certain mibs | 12 |
| Certain Middle East denizen | 27 |
| Certain Middle Easterner | 24 |
| Certain Middle Easterners | 25 |
| Certain middle irons | 20 |
| Certain Middle-earthling | 24 |
| Certain Mideast belief | 22 |
| Certain Mideast habitant | 24 |
| Certain Mideast native | 22 |
| Certain Mideast scholar | 23 |
| Certain Mideast specialists | 27 |
| Certain Midwestern tribe members | 32 |
| Certain Midwesterner | 20 |
| Certain migrant | 15 |
| Certain migrants | 16 |
| Certain migratory pattern | 25 |
| Certain mike supports | 21 |
| Certain mikes | 13 |
| Certain mil. corpsmen | 21 |
| Certain mil. member | 19 |
| Certain mil. people | 19 |
| Certain milestone | 17 |
| Certain military camp + magazine | 32 |
| Certain military force | 22 |
| Certain military leader | 23 |
| Certain military mess | 21 |
| Certain military pilot's rank | 33 |
| Certain milk container | 22 |
| Certain milk mixtures | 21 |
| Certain millworkers | 19 |
| Certain minced oaths | 20 |
| Certain mind | 12 |
| Certain mind game, literally | 28 |
| Certain mind tricks | 19 |
| Certain minister | 16 |
| Certain minstrel | 16 |
| Certain missile | 15 |
| Certain missile descriptor | 26 |
| Certain missiles | 16 |