There are 492 4-letter words containing M in the ENABLE dictionary — 13% of all 3,903 words at this length. M is a one-point tile, so the value in this list is positional rather than numerical — which of these you can play depends far more on where it fits the board than on what it scores.
The M falls in the first position more often than any other, in 209 of them. 16 of them use the letter more than once — ammo, imam, immy, maim among them, which is the case worth checking twice when a game has told you a letter is present but not how many times.
If you know more than one letter, this page stops being the fast way to find it. Enter what you have in the unscrambler — the Contains, Starts with and Ends with filters combine, and setting both length fields to 4 narrows this list to the handful your letters actually allow.
Where the M sits
M in the first position (209)
maar mabe mace mach mack macs made mads maes mage magi mags maid mail maim main mair make mako male mall malm malt mama mana mane mano mans many maps marc mare mark marl mars mart mash mask mass mast mate math mats matt maud maul maun maut mawn maws maxi maya mayo mays maze mazy mead meal mean meat meed meek meet meld mell mels melt memo mems mend meno menu meou meow mere merk merl mesa mesh mess meta mete meth mewl mews meze mhos mibs mica mice mick midi mids mien miff migg migs mike mild mile milk mill milo mils milt mime mina mind mine mini mink mint minx mire miri mirk mirs miry mise miso miss mist mite mitt mity mixt moan moas moat mobs mock mocs mode modi mods mogs moil mojo moke mola mold mole moll mols molt moly mome momi moms monk mono mons mony mood mool moon moor moos moot mope mops mopy mora more morn mors mort mosk moss most mote moth mots mott moue move mown mows moxa mozo much muck muds muff mugg mugs mule mull mumm mump mums mumu muni muns muon mura mure murk murr muse mush musk muss must mute muts mutt myna myth
M in the second position (38)
amah amas ambo amen amia amid amie amin amir amis ammo amok amps amus amyl emes emeu emfs emic emir emit emus emyd imam imid immy impi imps omen omer omit smew smit smog smug smut umbo umps
M in the third position (147)
acme agma aims alma alme alms arms army atma bams bema bima bomb bumf bump bums came camp cams coma comb come comp cwms cyma cyme dame damn damp dams deme demo demy dime dims dome doms duma dumb dump elms elmy fame feme fems fume fumy gama gamb game gamp gams gamy gems gimp gums gyms hame hams heme hemp hems home homo homy hump hums hymn iamb isms jamb jams jimp jump kame kami kemp lama lamb lame lamp lams lima limb lime limn limo limp limy lump lums name nema nims noma nome noms numb ohms pams pima pimp pome pomp poms puma pump rami ramp rams rems rime rims rimy romp roms rump rums same samp seme semi shmo sima simp sims soma some sumo sump sums tame tamp tams temp time tomb tome toms tump vamp vims wame wimp womb yams zyme
M in the fourth position (98)
ahem alum arum atom balm barm beam berm blam boom brim calm cham chum clam corm cram culm deem derm doom dorm doum dram drum exam farm film firm flam foam form from gaum germ geum glim glom glum gram grim grum haem halm harm helm herm holm idem item jism loam loom neem neum norm ogam ovum oxim palm perm plum poem pram prim prom ream roam room scam scum seam seem sham shim skim slam slim slum stem stum swam swim swum team teem term them toom tram trim warm wham whim whom worm ylem zoom