The List
There are 585 7 letter words with K as the first letter. The highest scoring is KOLKOZY at 27 points in Scrabble, though Words With Friends prefers KICKBOX at 28. 259 carry three or more vowels, which makes them useful for dumping a vowel-clogged rack.
KABADDIKABAKASKABALASKABAYASKABBALAKABELESKABIKISKABUKISKACCHASKACHCHAKACHERIKACHINAKADDISHKAFFIRSKAFILASKAFTANSKAGOOLSKAGOULEKAGOULSKAHAWAIKAHUNASKAIAKEDKAIKAISKAINGASKAINITEKAINITSKAISERSKAIZENSKAJAWAHKAJEPUTKAKAPOSKAKODYLKAKUROSKALENDSKALIANSKALIMBAKALIPHSKALIUMSKALMIASKALONGSKALOOKIKALPACSKALPAKSKALUKISKAMAHISKAMALASKAMELASKAMERADKAMICHIKAMILASKAMISESKAMPONGKAMSEENKAMSINSKANAKASKANBANSKANDIESKANGHASKANTARSKANTELAKANTELEKANTENSKANTHASKANTINGKANUKASKAOLINEKAOLINSKAPUKASKARAISMKARAITSKARAKASKARAKIAKARAKULKARAMUSKARANGAKARAOKEKARATESKARENGOKARITESKARKINGKAROROSKAROSHIKARROOSKARSEYSKARSIESKARSTICKARTERSKARTINGKARYONSKARZIESKASBAHSKASHERSKASHMIRKASHRUSKASHRUTKATANASKATCINAKATHAKSKATHODEKATIONSKATIPOSKATORGAKATSURAKATYDIDKAUPAPAKAURIESKAYAKEDKAYAKERKAYLIEDKAYOINGKEASARSKEAVIESKEBBIESKEBBINGKEBBOCKKEBBUCKKEBELESKEBLAHSKECKINGKECKLEDKECKLESKECKSESKEDDAHSKEDGERSKEDGIERKEDGINGKEECHESKEEKERSKEEKINGKEELAGEKEELERSKEELIESKEELINGKEELMANKEELMENKEELSONKEENERSKEENESTKEENINGKEEPERSKEEPINGKEEPNETKEESTERKEFFELSKEGELERKEGGERSKEGGINGKEGLERSKEGLINGKEIRENSKEIRINSKEISTERKEITLOAKEKENOSKEKSYESKELLAUTKELLIESKELOIDSKELPERSKELPIESKELPINGKELSONSKELTERSKELTIESKELVINSKEMBINGKEMBLASKEMBOEDKEMPERSKEMPIERKEMPINGKEMPLESKENCHESKENNELSKENNERSKENNETSKENNETTKENNINGKENOSESKENOSISKENOTICKENTIASKENTINGKEPHIRSKEPPINGKERAMICKERATINKERBAYAKERBINGKERCHOOKERERUSKERFINGKERKIERKERMESSKERNELSKERNINGKERNISHKERNITEKEROGENKERRIASKERRIESKERSEYSKERVINGKERYGMAKESTINGKESTRELKETCHESKETCHUPKETENESKETMIASKETONESKETONICKETOSESKETOSISKETOTICKETTLESKETUBAHKETUBOTKEWLESTKEWPIESKEYCARDKEYHOLEKEYINGSKEYLESSKEYLINEKEYNOTEKEYPADSKEYPALSKEYRINGKEYSETSKEYSTERKEYWAYSKEYWORDKGOTLASKHADDARKHALATSKHALIFAKHALIFSKHAMSINKHANATEKHANDASKHANGASKHANJARKHANUMSKHARIFSKHAYALSKHAZENSKHEDAHSKHEDIVAKHEDIVEKHILATSKHILIMSKHIMARSKHIRKAHKHODJASKHOTBAHKHOTBEHKHURTASKHUTBAHKIAUGHSKIBBEHSKIBBITZKIBBLEDKIBBLESKIBBUTZKIBITKAKIBLAHSKICKBOXKICKERSKICKIERKICKINGKICKOFFKICKOUTKICKUPSKIDDERSKIDDIEDKIDDIERKIDDIESKIDDINGKIDDISHKIDDLESKIDDOESKIDDUSHKIDGIERKIDLETSKIDLIKEKIDLINGKIDNAPSKIDNEYSKIDSKINKIDULTSKIDVIDSKIEKIESKIERIESKIESTERKIKUMONKIKUYUSKILERGSKILLCOWKILLDEEKILLERSKILLICKKILLIESKILLINGKILLJOYKILLOCKKILLUTSKILNINGKILOBARKILOBITKILORADKILOTONKILTERSKILTIESKILTINGKIMBOEDKIMCHEEKIMCHISKIMMERSKIMONOSKINARASKINASESKINCHINKINCOBSKINDERSKINDESTKINDIESKINDINGKINDLEDKINDLERKINDLESKINDREDKINEMASKINESESKINESICKINESISKINETICKINETINKINFOLKKINGCUPKINGDOMKINGINGKINGLESKINGLETKINGPINKINKIERKINKILYKINKINGKINKLESKINLESSKINONESKINREDSKINSHIPKINSMANKINSMENKIPPAGEKIPPERSKIPPINGKIPSKINKIPUNJIKIRANASKIRBEHSKIRIMONKIRKINGKIRKMANKIRKMENKIRKTONKIRMESSKIRNINGKIRPANSKIRTANSKIRTLEDKIRTLESKISHKASKISHKESKISMATSKISMETSKISSELSKISSERSKISSIERKISSINGKISTFULKISTINGKITBAGSKITCHENKITENGEKITHARAKITHINGKITINGSKITLINGKITSCHYKITSETSKITTELSKITTENSKITTENYKITTIESKITTINGKITTLEDKITTLERKITTLESKITTULSKLAPPEDKLATSCHKLAVERNKLAVIERKLAXONSKLEAGLEKLEENEXKLEPHTSKLEPTOSKLEZMERKLINKERKLIPDASKLISTERKLOOTCHKLUDGEDKLUDGESKLUDGEYKLUGINGKLUTZESKNACKEDKNACKERKNAIDELKNAPPEDKNAPPERKNAPPLEKNARREDKNAVERYKNAVISHKNAWELSKNEADEDKNEADERKNEECAPKNEEINGKNEELEDKNEELERKNEEPADKNEEPANKNEIDELKNELLEDKNESSETKNEVELLKNICKERKNIFERSKNIFINGKNIGHTSKNISHESKNITTEDKNITTERKNITTLEKNIVINGKNOBBEDKNOBBERKNOBBLEKNOBBLYKNOCKEDKNOCKERKNOLLEDKNOLLERKNOPPEDKNOTTEDKNOTTERKNOUTEDKNOWERSKNOWHOWKNOWINGKNUBBLEKNUBBLYKNUCKLEKNUCKLYKNURLEDKOBANGSKOBOLDSKOCHIASKOEKOEAKOFTGARKOHANIMKOKAKOSKOKANEEKOKIRISKOKOBEHKOKOPUSKOKOWAIKOLACKYKOLBASIKOLHOZYKOLKHOSKOLKHOZKOLKOZYKOMATIKKONAKISKONEKESKONFYTSKONGONIKONINISKONKINGKONNINGKOODOOSKOOKIERKOOKILYKOOKINGKOOLAHSKOORIESKOPECKSKOPIYKAKOPIYOKKOPPIESKORARISKOREROSKORKIRSKORORASKOROWAIKORUNASKOSHERSKOTARESKOTCHEDKOTCHESKOTOWEDKOTOWERKOTUKUSKOTWALSKOULANSKOUMISSKOUMYSSKOUPREYKOUSSOSKOWHAISKOWTOWSKRAALEDKRAKENSKRANSESKRANZESKRATERSKREESEDKREESESKREMLINKREUZERKRIMMERKRISINGKRUBUTSKRULLERKRUMPERKRUNKEDKRYPSESKRYPSISKRYPTONKRYTRONKUCCHASKUCHCHAKUCHENSKUDLIKSKUDOSESKUFIYAHKULBASAKULTURSKUMARASKUMARISKUMERASKUMITESKUMMELSKUMQUATKUMYSESKUNJOOSKUNKARSKUNKURSKUNZITEKURBASHKURGANSKURSAALKURVEYSKUTCHESKVASSESKVELLEDKVETCHYKWACHASKWAITOSKWANZASKYANISEKYANITEKYANIZEKYLICESKYLIKESKYNDINGKYOGENSKYTHING