Did you mean the exact middle? I hope not. You'll find some in this list though.
Some 7 letter words with K as the 5th letter:
baked, caked, hackers, eke, aka (abbreviation for 'also known as'),
alack, brick, crack, doorknob, flank, glockenspiel
Some seven letter words with N as the fifth letter areagainstbalancefriendspartnerqueenlyscienceseventy
Examples of seven letter words with the fifth letter 'A' are:abstainacreageadamantagitateapplaudattractavocadoaverageawkwardbandagebandanabargainbeneathblatantbombardbuffalobuzzardcabbagecalvarycanvasscaptaincascadecertaincharadeclimatecommandcompanycomparecompasscontactcontaincottagecouragecowhandcrusadecupcakecustarddeclaredefiantdefrauddespairdiscarddiseasedistantecstasyeducateelegantelevateemeraldengraveestuaryeyeballfantasyfondantforwardfurnacegallantgarbagegarlandgoulashgrenadegymnasthectareHollandhostagehusbandhydranthydrateimitateinflateinstallinstantisolatelanyardleopardlibrarylineageluggagelullabymagnatemandatemanmademassagemediatemessagemethanemigrantmigratemistakemontagemundanemustangmustardnarratenirvanaoddballoffhandoperateorchardoreganoorigamioutcastoutrageoutwardoveralloxidantoxidatepageantpancakeparfaitpartakepassagepaybackpeasantpendantpennantphalanxpharaohpigtailpillagepiquantpitfallplumagepostageprefaceprepareprevailprimaryprimateprivateprobatepropaneprosaicptomainpulsateradiantradiaterampagerampantransackrefrainreleasereliantremnantreplaceretraceretractrhubarbrummagesabbathsalvagesarcasmsatiatesausageseawallseawardservantsetbacksituateskylarksopranospinachsqueakystewardstomachstoragestreakysummarysurfacesurpasssustaintankardteacaketerraceterraintherapytherapytoenailtornadotravailtsunamiumbrageunleashupgradeurinatevagrantvaliantvantagevariantvibrantvibratevillagevillainvintageviolatevolcanovoltagewallabywannabewarfarewarrantwaywardwelfarewetlandyardage
Some six letter words with the fifth letter I are:acaciaacquitaffairafraidanemiaauntiebanditbarriobigwigbionicbobbinboogiecandidcatnipcervixcitricclericcliniccoffincolliecommitcookiecosmiccousincreditcriticculpritdahliadebrisdeceitdetaindevoiddimwitdomaineclairentaileroticethnicfabricferricforbidfrolicgarlicgerbilgossipGothichectichermitherniaheroinhorridhubrishybridiconicimpairinlaidironicitalicjerkinliquidmantismarginmarlinmemoirmohairmosaicmuffinmythicnapkinniacinnitricobtainorchidordainoriginoutfitoxtailpallidpectinpelvispencilpermitphobiapicnicpotpieprefixprofitpublicpulpitrabbitraisinrecoilremainrepairrookierusticsepticsordidspiritstaticstudiostupidsubmitsuffixsummittactictennistidbittorridtragictropicturnipurchinverminvictimviolinvirginweevilzinnia
Some seven letter words with O as the fifth letter are:abaloneacetoneadenoidaffrontairfoilairportalimonyamorousanalogyanatomyanchovyandroidanemoneanxiousanybodyanymoreapologyapprovearduousarmholeartworkaureoleawesomebailoutbalconyballoonbarroombassoonbazookabedrockbedroombetrothbehoovebighornbiliousbiologyblowoutboudoirboxwoodboycottboyhoodbuffoonbulbousbullockburdockburnoutbuttockcaboosecallouscalzonecannolicarpoolcarportcartooncassockcastoffcathodechamoischerootchicorycomfortcommodecomposecompostcompoteconcoctconcordconformconsoleconsortcontortcontourcookoutcopiouscorrodecowpokecoxcombcuckoldcuriouscustodycyclonedefrostdeploredespoildeviousdiamonddiplomadiscorddisposedisrobedistortdoggonedogwooddragoondropoutdubiousearlobeecologyeconomyepisodeepitomeeyesorefactoidfactoryfadeoutfalloutferrousfestoonforgoneforlornfuriousfurlonggaseousglucosegondolagranolagunboathaddockhammockhandouthangoutharmonyharpoonhassockhayloftheinoushemlockhickoryhideoushideouthillockhistoryhoedownholdouthormonehotfooticeboatigneousimpiousimplodeimploreimproveingrownisotopejawbonejealouskaraokekeyholekeynotelactoselampoonlegroomleprosylissomelogbooklookoutlowdownmammothmanholemanhoodmastoidmenfolkmicrobemidtownmistookmonsoonmudroomnegroidnervousnetworknewbornnitrousnobodynoisomenoxiousoarlockobviousodorousoffloadominousonerousoratoryoutcomeoutdoneoutlookoutpostoxbloodpaddockpadlockpalookaPandorapapooseparlourpatroonpayloadpayrollpeacockperformpersonapiccolopierogipignolipillorypillowypinholepinwormpiteousplatoonplayoffplywoodpollockpontoonpopcornpotholeprolongpromotepronounproposeprovokeprovostpurloinpurportpurposeraccoonrapportraucousraviolireadoutrectoryredwoodregroupreproverespondrestorerhizomeriotousripcordrowboatruinoussarcomasaviourschlockseafoodseaportsensorysequoiaseriousshowoffshutoutshylocksinuoussirloinsomeonespumonisteroidsucrosesundownsunroofsunroomsupportsupposetabloidtadpoletakeofftakeouttandoortapiocatedioustenfoldtenuousthyroidtimeouttinfoiltopcoattopsoiltrefoiltrilogytugboatturmoiltyphoonunicornuniformunknownurologyvacuousvamoosevariousverboseviciousvictoryviscosewarlockwarlordwedlockwelcomewillowywithoutworkoutyellowyzealouszoology
Some seven letter words with U as the fifth letter:AccountAdjournAgroundAssaultAstoundBanquetBecauseBedouinBiscuitBoroughBouquetCapsuleCaptureCarouseCensureCenturyCircuitClosureColludeCommuneCommuteComputeConduceConductConduitConfuseConjureConquerConsultConsumeCorruptCostumeCoutureCroquetCultureDebauchDefaultDelouseDentureDiffuseDiscussDisgustDisputeDisruptDisturbEarmuffEncrustEntrustErasureEvoluteExcludeExecuteExhaustExpoundExtrudeFissureFistulaFixtureFormulaFortuneGestureGradualGranuleHiccupsImpoundInboundIncludeIntrudeIntrustLawsuitLayoutsLeaguesLectureLeisureLettuceLingualManhuntMarqueeMeasureMercuryMixtureMolluskNurtureObscureObtrudeOverusePasturePenguinPerfumePerjurePerjuryPicturePollutePosturePotluckPreludePresumeProcureProduceProductProfusePursuitRacquetRaptureReboundRecluseRecountRecruitResoundRetouchRoebuckRuptureSawbuckSawdustScapulaSchmuckScroungeSeagullSecludeSeizureSensualSpatulaStatureStatuteSuccumbSunburnTactualTextureThroughTortureTribuneTributeUnboundUnequalUnplugsUntrulyUpchuckVentureVirtualWalnutsWarmupsWetsuitWindupsYoghurt
Some seven letter words that end with 'ure' are:capturecensureclosureconjureculturedentureepicureerasurefailurefeaturefissurefixturegesturelectureleisuremeasuremixturenurtureobscurepastureperjurepicturepostureprocureraptureruptureseizuretexturetonsuretortureventurevulture
Some seven letter words that start with a B include:baffledbankingbarkingbashfulbecausebelievebeneathbeggingblanketblenderblessedblisterblinkerblockerblossomblotterblastedblackenblatherblushedblunderblurtedbonfirebroughtbrittlebrisklybrieflybrotherbutterybutcherbuntingbustingbungled
Some five letter words with second letter U and fifth letter T are:auditbuiltburntburstcubitduvetguestguiltoughtquartquestquiltquintwurst
Some nine letter words with T as the fifth letter:AdulthoodAirstreamAirstrikeAlbatrossAlertnessAllotmentAllotropeAmbitiousAntitoxinApartmentApostolicAppetizerArbitrageArbitraryArbitrateAwestruckBeautifulBlowtorchBounteousBountifulBowstringBuckteethBucktoothCafeteriaCaretakerCatatonicCoastlineConstableConstrainConstrictConstructCountableCountdownCountlessCountriesCourteousCourtlierCourtroomCourtshipCourtyardCraftsmanDebutanteDecathlonDelftwareDigitallyDiphthongDishtowelDoubtlessDowntrendDraftsmanDriftwoodEightfoldEightiethElectrifyElectrodeEmpathizeEnactmentEventuateExcitableExistenceEyestrainFacetiousFaintnessFanaticalFirstbornFirsthandFluctuateForetasteFrostbiteFruitcakeFrustrateGhostlikeGreatcoatGreatnessGristmillGuestroomHabituateHamstringHamstrungHealthierHeartacheHeartbeatHeartburnHeartfeltHeartlandHeartlessHeartsickHeartwoodHesitanceIdenticalImpatientInfatuateIrritableKeystrokeLeastwiseLightfaceLightshipLimitlessMaritallyMelatoninMenstrualMidstreamMinutemanNightclubNightfallNightgownNighthawkNightlifeNightlongNightmareNightspotNighttimeNightwearNinetiethOverthrowPenetratePhantasmaPlantlikePlaythingPlentifulPointlessPoliticalProstratePunctuateQuarterlyQuietnessQuintetteQuintupleQuittanceRacetrackRefutableRighteousRightwardSainthoodSaintlikeSanctuarySheetlikeShirtlessShirttailShortcakeShortfallShorthandShorthornShortstopShortwaveSightseerSkepticalSkintightSlantwiseSolitaireSomethingSometimesSpectacleSpectatorSportsmanStrategicSunstrokeSweatshopSweetenerSweetshopTemptressThirtiethTightropeTimetableTreatableTreatmentTriathlonTurntableUnnaturalUnnoticedUnwittingVegetableWaistbandWaistcoatWaistlineWorktableWrestlingWristbandYachtsman
Some five letter words that have a third letter O and fifth letter E are:abodeaboveadobeadorealonearoseatoneawokebiomeblokeboozebrokechokechorechoseclonecloseclovecronediodedronedroveelopeemoteerodeevokefrozegeodeglobeglovegnomegoosegropegrovekroneloosemoosenooseozonephoneprobeproneproseprovequotesconescopescoreshoneshoreshoveslopesmokesnorespokesporestokestolestonestorestovesworetholethosetrovewholewhosewrote
Some seven letter words with three As are:alfalfabandanacassabalasagnamalariaOceaniapanaceasavanna
Some six letter words that have O being the 5th letter:ActionAnalogAnchorAnyhowAuthorBaboonBallotBambooBarhopBarrowBeaconBeckonBellowBestowBetookBettorBillowBishopBorrowBottomBunionBusboyButtonCannonCannotCanyonCaptorCarbonCarboyCarhopCarrotCartonCensorClamorCocoonCommonConvoyCottonCouponCowboyCrayonCuckooCursorCustomDeaconDebtorDeployDoctorDollopDragonEditorEggnogEmployEscrowFactorFalconFallowFathomFellowFervorFlavorFollowForgotFusionGallonGallopGambolGlamorGodsonHallowHansomHarborHereofHereonHollowHorrorIceboxIndoorInflowJargon