The List
There are 672 5 letter words with M as the first letter. The highest scoring is MUZZY at 28 points in Scrabble. 3 of them contain no vowel at all: MYRRH, MYTHS, MYTHY.
MAAEDMAAREMAARSMABESMACAWMACEDMACERMACESMACHEMACHIMACHOMACHSMACKSMACLEMACONMACROMADAMMADGEMADIDMADLYMADREMAERLMAFIAMAFICMAGESMAGGSMAGICMAGMAMAGOTMAGUSMAHOEMAHUAMAHWAMAIDSMAIKOMAIKSMAILEMAILLMAILSMAIMSMAINSMAIREMAIRSMAISEMAISTMAIZEMAJORMAKARMAKERMAKESMAKISMAKOSMALAMMALARMALASMALAXMALESMALICMALIKMALISMALLSMALMSMALMYMALTSMALTYMALVAMALWAMAMASMAMBAMAMBOMAMEEMAMEYMAMIEMAMMAMAMMYMANASMANATMANDIMANEDMANEHMANESMANETMANGAMANGEMANGOMANGSMANGYMANIAMANICMANISMANKYMANLYMANNAMANORMANOSMANSEMANTAMANTOMANTYMANULMANUSMAPAUMAPLEMAQUIMARAEMARAHMARASMARCHMARCSMARDYMARESMARGEMARGSMARIAMARIDMARKAMARKSMARLEMARLSMARLYMARMSMARONMARORMARRIMARRYMARSEMARSHMARTSMARVYMASASMASEDMASERMASESMASHYMASKSMASONMASSAMASSEMASSYMASTSMASTYMASUSMATAIMATCHMATEDMATERMATESMATEYMATHSMATINMATLOMATTEMATTSMATZAMATZOMAUBYMAUDSMAULSMAUNDMAURIMAUTSMAUVEMAVENMAVIEMAVINMAVISMAWEDMAWKSMAWKYMAWRSMAXEDMAXESMAXIMMAXISMAYANMAYASMAYBEMAYEDMAYORMAYOSMAYSTMAZEDMAZERMAZESMAZEYMAZUTMBIRAMEADSMEALSMEALYMEANEMEANSMEANTMEANYMEAREMEASEMEATHMEATSMEATYMEBOSMECCAMECKSMEDALMEDIAMEDICMEDIIMEDLEMEEDSMEERSMEETSMEFFSMEINSMEINTMEINYMEITHMEKKAMELASMELBAMELDSMELEEMELICMELIKMELLSMELONMELTSMELTYMEMESMEMOSMENADMENDSMENEDMENESMENGEMENGSMENSAMENSEMENSHMENTAMENTOMENUSMEOUSMEOWSMERCHMERCSMERCYMERDEMEREDMERELMERERMERESMERGEMERILMERISMERITMERKSMERLEMERLSMERRYMERSEMESALMESASMESELMESESMESHYMESICMESNEMESONMESSYMESTOMETALMETEDMETERMETESMETHOMETHSMETICMETIFMETISMETOLMETREMETROMEUSEMEVEDMEVESMEWEDMEWLSMEYNTMEZESMEZZEMEZZOMHORRMIAOUMIAOWMIASMMIAULMICASMICHEMICHTMICKSMICKYMICOSMICRAMICROMIDDYMIDGEMIDGYMIDISMIDSTMIENSMIEVEMIFFSMIFFYMIFTYMIGGSMIGHTMIHASMIHISMIKEDMIKESMIKRAMILCHMILDSMILERMILESMILIAMILKOMILKSMILKYMILLEMILLSMILORMILOSMILPAMILTSMILTYMILTZMIMEDMIMEOMIMERMIMESMIMICMIMSYMINAEMINARMINASMINCEMINCYMINDSMINEDMINERMINESMINGEMINGSMINGYMINIMMINISMINKEMINKSMINNYMINORMINOSMINTSMINTYMINUSMIREDMIRESMIREXMIRINMIRKSMIRKYMIRLYMIROSMIRTHMIRVSMIRZAMISCHMISDOMISERMISESMISGOMISOSMISSAMISSYMISTSMISTYMITCHMITERMITESMITISMITREMITTSMIXEDMIXENMIXERMIXESMIXTEMIXUPMIZENMIZZYMNEMEMOANSMOATSMOBBYMOBESMOBEYMOBIEMOBLEMOCHAMOCHSMOCHYMOCKSMODALMODELMODEMMODERMODESMODGEMODIIMODUSMOERSMOGGYMOGULMOHELMOHRSMOHUAMOHURMOILSMOIRAMOIREMOISTMOITSMOJOSMOKESMOKISMOKOSMOLALMOLARMOLASMOLDSMOLDYMOLESMOLLAMOLLSMOLLYMOLTOMOLTSMOMESMOMMAMOMMYMOMUSMONADMONALMONASMONDEMONDOMONERMONEYMONGOMONGSMONIEMONKSMONOSMONTEMONTHMONTYMOOBSMOOCHMOODSMOODYMOOEDMOOKSMOOLAMOOLIMOOLSMOOLYMOONGMOONSMOONYMOOPSMOORSMOORYMOOSEMOOTSMOOVEMOPEDMOPERMOPESMOPEYMOPPYMOPSYMOPUSMORAEMORALMORASMORATMORAYMORELMORESMORIAMORNEMORNSMORONMORPHMORRAMORROMORSEMORTSMOSEDMOSESMOSEYMOSKSMOSSOMOSSYMOSTEMOSTSMOTEDMOTELMOTENMOTESMOTETMOTEYMOTHSMOTHYMOTIFMOTISMOTORMOTTEMOTTOMOTTSMOTTYMOTUSMOTZAMOUCHMOUESMOULDMOULSMOULTMOUNDMOUNTMOUPSMOURNMOUSEMOUSTMOUSYMOUTHMOVEDMOVERMOVESMOVIEMOWASMOWEDMOWERMOWRAMOXASMOXIEMOYASMOYLEMOYLSMOZEDMOZESMOZOSMPRETMUCHOMUCICMUCIDMUCINMUCKSMUCKYMUCORMUCROMUCUSMUDDYMUDGEMUDIRMUDRAMUFFSMUFTIMUGGAMUGGSMUGGYMUHLYMUIDSMUILSMUIRSMUISTMUJIKMULCHMULCTMULEDMULESMULEYMULGAMULLAMULLSMULSEMULSHMUMMSMUMMYMUMPSMUMSYMUMUSMUNCHMUNGAMUNGEMUNGOMUNGSMUNISMUNTSMUNTUMUONSMURALMURASMUREDMURESMUREXMURIDMURKSMURKYMURLSMURLYMURRAMURREMURRIMURRSMURRYMURTIMURVAMUSARMUSCAMUSEDMUSERMUSESMUSETMUSHAMUSHYMUSICMUSITMUSKSMUSKYMUSOSMUSSEMUSSYMUSTHMUSTSMUSTYMUTCHMUTEDMUTERMUTESMUTISMUTONMUTTSMUXEDMUXESMUZZYMVULEMYALLMYLARMYNAHMYNASMYOIDMYOMAMYOPEMYOPSMYOPYMYRRHMYSIDMYTHIMYTHSMYTHYMYXOSMZEES