The List
There are 844 7 letter words with O as the first letter. The highest scoring is OZONIZE at 25 points in Scrabble. 764 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
OAKIESTOAKLIKEOAKLINGOAKMOSSOARAGESOARFISHOARIESTOARLESSOARLIKEOARLOCKOARSMANOARSMENOARWEEDOATCAKEOATIESTOATLIKEOATMEALOBCONICOBDUREDOBDURESOBEAHEDOBECHESOBEISMSOBELIASOBELIONOBELISEOBELISKOBELISMOBELIZEOBENTOSOBESELYOBESESTOBESITYOBEYERSOBEYINGOBIISMSOBITUALOBJECTSOBJUREDOBJURESOBLASTIOBLASTSOBLATESOBLIGEDOBLIGEEOBLIGEROBLIGESOBLIGOROBLIQUEOBLONGSOBLOQUYOBOISTSOBOLARYOBOVATEOBOVOIDOBSCENEOBSCUREOBSEQUYOBSERVEOBSIGNSOBTAINSOBTENDSOBTESTSOBTRUDEOBTUNDSOBTUSEROBVERSEOBVERTSOBVIATEOBVIOUSOCARINAOCCIPUTOCCLUDEOCCULTSOCEANICOCEANIDOCELLAROCELLUSOCELOIDOCELOTSOCHEREDOCHREAEOCHRINGOCHROIDOCHROUSOCICATSOCREATEOCTADICOCTAGONOCTANESOCTANOLOCTANTSOCTAPLAOCTAVALOCTAVESOCTAVOSOCTETTEOCTETTSOCTOFIDOCTOPODOCTOPUSOCTROISOCTUORSOCTUPLEOCTUPLYOCULARSOCULATEOCULISTODALISKODALLERODDBALLODDMENTODDNESSODDSMANODDSMENODONATEODONTICODORANTODORATEODORFULODORISEODORIZEODOROUSODOUREDODYLISMODYSSEYODZOOKSOECISTSOEDEMASOEDIPALOENOMELOERSTEDOESTRALOESTRINOESTRUMOESTRUSOEUVRESOFFBEATOFFCASTOFFCUTSOFFENCEOFFENDSOFFENSEOFFEREDOFFEREEOFFEREROFFEROROFFHANDOFFICEROFFICESOFFINGSOFFLINEOFFLOADOFFPEAKOFFPUTSOFFRAMPOFFSCUMOFFSETSOFFSIDEOFFTAKEOFTENEROGDOADSOGHAMICOGLINGSOGREISHOGREISMOGRISMSOHMAGESOIDIOIDOIKISTSOILBIRDOILCAMPOILCANSOILCUPSOILHOLEOILIESTOILLETSOILNUTSOILSEEDOILSKINOILWAYSOINKINGOINOMELOINTINGOKAYINGOKIMONOOLDENEDOLDNESSOLDSTEROLDWIFEOLEARIAOLEATESOLEFINEOLEFINSOLEINESOLESTRAOLFACTSOLICOOKOLIGISTOLINGOSOLITORYOLIVARYOLIVERSOLIVETSOLIVINEOLLAMHSOLOGIESOLOGISTOLOGOANOLOROSOOLYCOOKOLYKOEKOMELETSOMENINGOMENTALOMENTUMOMERTASOMICRONOMIKRONOMINOUSOMITTEDOMITTEROMMATEAOMNEITYOMNIANAOMNIBUSOMNIETYOMNIFICOMNIUMSOMPHALIONAGERSONANISMONANISTONBEATSONBOARDONCOGENONCOMESONCOSTSONDATRAONDINESONDINGSONEFOLDONEIRICONENESSONERIERONEROUSONESELFONETIMEONEYERSONEYRESONFALLSONFLOWSONGOINGONIONEDONLIESTONLINERONLOADSONSHOREONSIDESONSTAGEONSTEADONWARDSONYCHASONYCHIAONYMOUSOOCYSTSOOCYTESOODLINSOOFIESTOOFTISHOOGONIAOOLAKANOOLITESOOLITHSOOLITICOOLOGICOOLONGSOOMIACKOOMIACSOOMIAKSOOMPAHSOOPHYTEOORALISOORIALSOORIESTOOSIESTOOSPERMOOSPOREOOTHECAOOZIESTOPACIFYOPACITYOPACOUSOPALINEOPAQUEDOPAQUEROPAQUESOPCODESOPENERSOPENESTOPENINGOPERANDOPERANTOPERATEOPERONSOPEROSEOPGEFOKOPHITESOPHITICOPHIURAOPIATEDOPIATESOPININGOPINIONOPIOIDSOPORICEOPOSSUMOPPIDANOPPOSALOPPOSEDOPPOSEROPPOSESOPPRESSOPPUGNSOPSONICOPSONINOPTANTSOPTICALOPTIMALOPTIMESOPTIMUMOPTIONSOPULENTOPUNTIAOPUSCLEOQUASSAORACHESORACIESORACLEDORACLESORALISMORALISTORALITYORANGERORANGESORANGEYORARIANORARIONORARIUMORATINGORATIONORATORSORATORYORATRIXORBIESTORBITALORBITASORBITEDORBITERORBLESSORCEINSORCHARDORCHATSORCHELSORCHIDSORCHILSORCINESORCINOLORDAINSORDEALSORDEREDORDERERORDERLYORDINALORDINARORDINEEORDINESORDURESOREADESORECTICOREGANOOREIDESOREWEEDOREXINSORFRAYSORGANDYORGANICORGANONORGANUMORGANZAORGEATSORGIASTORGONESORIENCYORIENTSORIFICEORIGAMIORIGANEORIGANSORIGINSORIHOUSORIOLESORISHASORISONSORLEANSORMOLUSORNATERORNISESOROGENSOROGENYOROIDESOROLOGYOROPESAOROTUNDORPHANSORPHISMORPHREYORPINESORRAMANORRAMENORRICESORRISESORTHIANORTHROSORTOLANOSCHEALOSCINESOSCULAROSCULESOSCULUMOSETRASOSIEREDOSMATESOSMATICOSMIATEOSMIOUSOSMIUMSOSMOLALOSMOLAROSMOLESOSMOSEDOSMOSESOSMOSISOSMOTICOSMUNDAOSMUNDSOSPREYSOSSEINSOSSELETOSSEOUSOSSETEROSSETRAOSSICLEOSSIFICOSSUARYOSTENTSOSTEOIDOSTEOMAOSTIARYOSTIATEOSTIOLEOSTLERSOSTMARKOSTOSESOSTOSISOSTRACAOSTRAKAOSTRICHOTALGIAOTALGICOTARIESOTARINEOTOCYSTOTOLITHOTOLOGYOTTAVASOTTEREDOTTOMANOUABAINOUAKARIOUCHINGOUGHTEDOUGLIEDOUGLIESOUGUIYAOULAKANOULDESTOULONGSOURALISOURANGSOURARISOUREBISOURIESTOURSELFOUSTERSOUSTINGOUSTITIOUTACTSOUTADDSOUTAGESOUTASKSOUTBACKOUTBAKEOUTBARKOUTBARSOUTBAWLOUTBEAMOUTBEGSOUTBIDSOUTBRAGOUTBREDOUTBULKOUTBURNOUTBUYSOUTCALLOUTCASTOUTCHIDOUTCITYOUTCOMEOUTCOOKOUTCROPOUTCROWOUTDAREOUTDATEOUTDOEROUTDOESOUTDONEOUTDOOROUTDRAGOUTDRAWOUTDREWOUTDROPOUTDUELOUTDUREOUTEARNOUTEATSOUTECHOOUTEDGEOUTFACEOUTFALLOUTFASTOUTFAWNOUTFEELOUTFELTOUTFINDOUTFIREOUTFISHOUTFITSOUTFLEWOUTFLOWOUTFOOLOUTFOOTOUTGAINOUTGATEOUTGAVEOUTGAZEOUTGIVEOUTGLOWOUTGNAWOUTGOEROUTGOESOUTGONEOUTGREWOUTGRINOUTGROWOUTGUNSOUTGUSHOUTHAULOUTHEAROUTHIREOUTHITSOUTHOWLOUTHUNTOUTHYREOUTINGSOUTJESTOUTJETSOUTJINXOUTJUMPOUTJUTSOUTKEEPOUTKEPTOUTKICKOUTKILLOUTKISSOUTLAIDOUTLAINOUTLANDOUTLASHOUTLASTOUTLAWSOUTLAYSOUTLEADOUTLEAPOUTLERSOUTLETSOUTLIEDOUTLIEROUTLIESOUTLINEOUTLIVEOUTLOOKOUTLOVEOUTMANSOUTMODEOUTMOSTOUTMOVEOUTNAMEOUTNESSOUTPACEOUTPARTOUTPASSOUTPEEPOUTPEEROUTPITYOUTPLANOUTPLAYOUTPLODOUTPLOTOUTPOLLOUTPORTOUTPOSTOUTPOUROUTPRAYOUTPULLOUTPUSHOUTPUTSOUTRACEOUTRAGEOUTRANGOUTRANKOUTRATEOUTRAVEOUTREADOUTREDSOUTRIDEOUTRIGSOUTRINGOUTROAROUTROCKOUTRODEOUTROLLOUTROOPOUTROOTOUTROPEOUTROWSOUTRUNGOUTRUNSOUTRUSHOUTSAIDOUTSAILOUTSANGOUTSAYSOUTSEENOUTSEESOUTSELLOUTSERTOUTSETSOUTSHOTOUTSIDEOUTSINGOUTSINSOUTSITSOUTSIZEOUTSOAROUTSOLDOUTSOLEOUTSPANOUTSPEDOUTSTAYOUTSTEPOUTSULKOUTSUMSOUTSUNGOUTSWAMOUTSWIMOUTSWUMOUTTAKEOUTTALKOUTTASKOUTTELLOUTTOLDOUTTOOKOUTTOPSOUTTROTOUTTURNOUTVIEDOUTVIESOUTVOTEOUTWAITOUTWALKOUTWARDOUTWARSOUTWASHOUTWEAROUTWEEDOUTWEEPOUTWELLOUTWENTOUTWEPTOUTWICKOUTWILEOUTWILLOUTWINDOUTWINGOUTWINSOUTWISHOUTWITHOUTWITSOUTWOREOUTWORKOUTWORNOUTWRITOUTYELLOUTYELPOUVERTEOUVRAGEOUVRIEROVALITYOVARIALOVARIANOVARIESOVATELYOVATINGOVATIONOVATORSOVENINGOVERACTOVERAGEOVERALLOVERAPTOVERARMOVERATEOVERAWEOVERBEDOVERBETOVERBIDOVERBIGOVERBUYOVERCOYOVERCUTOVERDIDOVERDOGOVERDRYOVERDUBOVERDUEOVERDYEOVEREATOVEREGGOVEREYEOVERFAROVERFATOVERFEDOVERFITOVERFLYOVERGETOVERGOTOVERHITOVERHOTOVERINGOVERJOYOVERLAPOVERLAXOVERLAYOVERLETOVERLIEOVERLITOVERMANOVERMENOVERMIXOVERNETOVERNEWOVERPAYOVERPLYOVERRANOVERREDOVERRENOVERRUNOVERSADOVERSAWOVERSEAOVERSEEOVERSETOVERSEWOVERSOWOVERSUPOVERTAXOVERTIPOVERTLYOVERTOPOVERUSEOVERWETOVICIDEOVIDUCTOVIFORMOVIPARAOVISACSOVOIDALOVONICSOVULARYOVULATEOWLIESTOWLLIKEOWNABLEOWRELAYOWRIESTOXALATEOXAZINEOXBLOODOXCARTSOXFORDSOXGANGSOXGATESOXHEADSOXHEARTOXHIDESOXIDANTOXIDASEOXIDATEOXIDISEOXIDIZEOXLANDSOXONIUMOXSLIPSOXTAILSOXTEREDOXYACIDOXYGENSOXYMELSOXYMORAOXYNTICOXYPHILOXYSALTOXYSOMEOXYTONEOYESSESOYSTERSOZAENASOZALIDSOZONATEOZONIDEOZONISEOZONIZEOZONOUS