The List
There are 1205 6 letter words with M as the first letter. The highest scoring is MIZZLY at 29 points in Scrabble, though Words With Friends prefers MUZJIK at 31. 1 of them contain no vowel at all: MYRRHS.
MAAINGMAASESMABELAMACACOMACAWSMACERSMACHANMACHERMACHESMACHOSMACINGMACKLEMACLEDMACLESMACONSMACOYAMACRONMACROSMACULAMACULEMADAFUMADAMEMADAMSMADCAPMADDEDMADDENMADDERMADEFYMADGESMADMANMADMENMADRASMADRESMADTOMMADUROMAELIDMAENADMAERLSMAFFIAMAFIASMAFICSMAFTEDMAFTIRMAGGEDMAGGIEMAGGOTMAGIANMAGICSMAGILPMAGISMMAGLEVMAGMASMAGNESMAGNETMAGNONMAGNOXMAGNUMMAGNUSMAGOTSMAGPIEMAGUEYMAGYARMAHEWUMAHMALMAHOESMAHOUTMAHSIRMAHUASMAHWASMAHZORMAIDANMAIDEDMAIDENMAIGREMAIHEMMAIKOSMAILEDMAILERMAILESMAILLSMAIMEDMAIMERMAINEDMAINERMAINLYMAINORMAIRESMAISESMAISTSMAIZESMAJLISMAJORSMAKARSMAKERSMAKEUPMAKINGMAKUTAMAKUTUMALADYMALAMSMALARSMALATEMALEICMALFEDMALGREMALIBUMALICEMALIGNMALIKSMALINEMALISMMALISTMALKINMALLAMMALLEDMALLEEMALLEIMALLETMALLOWMALMAGMALOTIMALTEDMALTHAMALTOLMALVASMALWASMAMAKOMAMAKUMAMBASMAMBOSMAMEESMAMEYSMAMIESMAMLUKMAMMAEMAMMALMAMMASMAMMEEMAMMERMAMMETMAMMEYMAMMIEMAMMONMAMZERMANAGEMANAIAMANANAMANATIMANATSMANATUMANAWAMANCHEMANCUSMANDIRMANDISMANDOMMANEGEMANEHSMANENTMANFULMANGALMANGASMANGEDMANGELMANGERMANGESMANGEYMANGLEMANGOSMANIACMANIASMANICSMANIESMANILAMANIOCMANITOMANITUMANNANMANNASMANNEDMANNERMANOAOMANORSMANQUEMANREDMANSESMANTASMANTELMANTESMANTICMANTIDMANTISMANTLEMANTOSMANTRAMANTUAMANUALMANUKAMANULSMANUREMAOMAOMAPAUSMAPLESMAPPEDMAPPERMAQUISMARABIMARACAMARAESMARAHSMARARIMARAUDMARBLEMARBLYMARCELMAREROMARGAYMARGESMARGINMARIDSMARIESMARINAMARINEMARISHMARKASMARKEDMARKERMARKETMARKKAMARKUPMARLEDMARLESMARLINMARMEMMARMOTMARONSMAROONMARORSMARQUEMARRAMMARREDMARRERMARRISMARRONMARROWMARRUMMARSESMARSHYMARTEDMARTELMARTENMARTINMARTYRMARVELMARVERMASALAMASCLEMASCONMASCOTMASERSMASHEDMASHERMASHESMASHIEMASHUAMASHUPMASINGMASJIDMASKEDMASKEGMASKERMASLINMASONSMASQUEMASSASMASSEDMASSESMASSIFMASTEDMASTERMASTICMASTIXMASULAMATAISMATATAMATATUMATERSMATEYSMATICOMATIERMATIESMATILYMATINGMATINSMATIPOMATJESMATLOSMATLOWMATOKEMATRESMATRICMATRIXMATRONMATSAHMATTEDMATTERMATTESMATTIEMATTINMATUREMATZAHMATZASMATZOHMATZOSMATZOTMAUGERMAUGREMAULEDMAULERMAULVIMAUMETMAUNDSMAUNDYMAUNGYMAUNNAMAURISMAUVERMAUVESMAUVINMAVENSMAVIESMAVINSMAWGERMAWINGMAWKINMAWMETMAWPUSMAXIMAMAXIMSMAXINGMAXIXEMAYBESMAYDAYMAYESTMAYFLYMAYHAPMAYHEMMAYINGMAYORSMAYPOPMAYVINMAZARDMAZERSMAZHBIMAZIERMAZILYMAZINGMAZOUTMAZUMAMAZUTSMBIRASMEADOWMEAGERMEAGREMEALEDMEALERMEALIEMEANEDMEANERMEANESMEANIEMEANLYMEARESMEASEDMEASESMEASLEMEASLYMEATALMEATEDMEATHEMEATHSMEATUSMEAWESMEAZELMECCASMEDAKAMEDALSMEDDLEMEDFLYMEDIADMEDIAEMEDIALMEDIANMEDIASMEDICKMEDICOMEDICSMEDINAMEDIUMMEDIUSMEDLARMEDLEDMEDLESMEDLEYMEDUSAMEEKENMEEKERMEEKLYMEEMIEMEEREDMEETERMEETLYMEGARAMEGASSMEGILPMEGOHMMEGRIMMEHNDIMEIKLEMEINEDMEINEYMEINIEMEISHIMEITHSMEJLISMEKKASMELANOMELDEDMELDERMELEESMELENAMELICKMELICSMELIKSMELLAYMELLEDMELLOWMELODYMELOIDMELONSMELTEDMELTERMELTONMEMBERMEMOIRMEMORYMENACEMENADSMENAGEMENDEDMENDERMENEERMENGEDMENGESMENHIRMENIALMENINGMENINXMENSAEMENSALMENSASMENSCHMENSEDMENSESMENTALMENTEEMENTORMENTOSMENTUMMENUDOMENYIEMEOUEDMEOWEDMERCATMERCERMERCESMERDESMERELLMERELSMERELYMERESTMERGEDMERGEEMERGERMERGESMERILSMERINGMERINOMERISMMERITSMERKINMERLESMERLINMERLONMERLOTMERMANMERMENMEROMEMERSESMESAILMESCALMESELSMESETAMESHEDMESHESMESIADMESIALMESIANMESNESMESONSMESSANMESSEDMESSESMESTEEMESTERMESTOMMETAGEMETALSMETATEMETEORMETEPAMETERSMETHODMETHOSMETHYLMETICSMETIERMETIFSMETINGMETOLSMETOPEMETREDMETRESMETRICMETROSMETTLEMETUMPMEUSEDMEUSESMEVINGMEVROUMEWINGMEWLEDMEWLERMEWSEDMEWSESMEZAILMEZCALMEZUZAMEZZESMEZZOSMGANGAMHORRSMIAOUSMIAOWSMIASMAMIASMSMIAULSMIBUNAMICATEMICELLMICHEDMICHERMICHESMICHTSMICKEYMICKLEMICRONMICROSMIDAIRMIDCAPMIDDAYMIDDENMIDDIEMIDDLEMIDGESMIDGETMIDGIEMIDGUTMIDLEGMIDRIBMIDSTSMIDWAYMIELIEMIEVEDMIEVESMIFFEDMIGGLEMIGHTSMIGHTYMIGNONMIHIEDMIHRABMIKADOMIKINGMIKRONMIKVAHMIKVEHMIKVOSMIKVOTMILADIMILADYMILAGEMILDEDMILDENMILDERMILDEWMILDLYMILERSMILIEUMILIUMMILKEDMILKENMILKERMILKOSMILLEDMILLERMILLESMILLETMILLIEMILNEBMILORDMILORSMILPASMILSEYMILTEDMILTERMIMBARMIMEOSMIMERSMIMICSMIMINGMIMMERMIMOSAMIMSEYMINARSMINBARMINCEDMINCERMINCESMINDEDMINDERMINERSMINGEDMINGERMINGESMINGLEMINIERMINIFYMINIMAMINIMSMININGMINIONMINISHMINIUMMINKESMINNIEMINNOWMINORSMINTEDMINTERMINUETMINUTEMINXESMINYANMIOMBOMIOSESMIOSISMIOTICMIRAGEMIRCHIMIRIERMIRINGMIRINSMIRITIMIRKERMIRRORMIRTHSMIRVEDMIRZASMISACTMISADDMISAIMMISATEMISCUEMISCUTMISDIDMISEATMISEREMISERSMISERYMISFEDMISFITMISHAPMISHITMISHMIMISKALMISKENMISKEYMISLAYMISLEDMISLIEMISLITMISMETMISPENMISSAEMISSALMISSAWMISSAYMISSEDMISSEEMISSELMISSESMISSETMISSISMISSUSMISTALMISTEDMISTERMISTLEMISUSEMISUSTMITERSMITHERMITIERMITRALMITREDMITRESMITTENMIURUSMIXENSMIXERSMIXIERMIXINGMIXUPSMIZENSMIZUNAMIZZENMIZZESMIZZLEMIZZLYMNEMESMNEMICMNEMONMOANEDMOANERMOATEDMOBBEDMOBBERMOBBIEMOBBLEMOBCAPMOBEYSMOBIESMOBILEMOBLEDMOBLESMOBLOGMOCHASMOCHIEMOCKEDMOCKERMOCKUPMOCOCKMOCUCKMODALSMODDEDMODDERMODELSMODEMSMODENAMODERNMODERSMODESTMODGEDMODGESMODICAMODIFYMODISHMODISTMODIUSMODULEMODULIMODULOMOEREDMOFFIEMOGGANMOGGEDMOGGIEMOGHULMOGULSMOHAIRMOHAWKMOHELSMOHUASMOHURSMOIDERMOIETYMOILEDMOILERMOIRAIMOIRESMOISERMOISTSMOJITOMOJOESMOKIHIMOKOROMOKSHAMOLARSMOLDEDMOLDERMOLESTMOLIESMOLINEMOLLAHMOLLASMOLLIEMOLOCHMOLTEDMOLTENMOLTERMOMENTMOMISMMOMMASMOMMETMOMSERMOMZERMONACTMONADSMONALSMONAULMONDESMO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