15-letter words
acknowledgement, acknowledgments, alkalinizations, ankylostomiases, ankylostomiasis, backscatterings, childlikenesses, cholecystokinin, counterattacked, counterattacker, counterblockade, counterchecking, counterpicketed, disembarkations, electrokinetics, greensicknesses, heartbreakingly, heartsicknesses, kaffeeklatsches, keratinizations, kindergarteners, kindheartedness, kinesthetically, kittenishnesses, kremlinologists, lackadaisically, leukaemogeneses, leukaemogenesis, lickerishnesses, marketabilities, microearthquake, mountebankeries, musculoskeletal, outspokennesses, persnicketiness, pharmacokinetic, phenylketonuria, phenylketonuric, phytoplanktonic, plainspokenness, prekindergarten, stockbrokerages, straightjackets, straitjacketing, strikebreakings, talkativenesses, telekinetically, thanklessnesses, thinkablenesses, thunderstricken, thunderstriking, unknowabilities, unknowledgeable, unsportsmanlike, unworkabilities
16-letter words
acknowledgements, antiracketeering, cantankerousness, cholecystokinins, counterattackers, counterattacking, counterblockaded, counterblockades, counterclockwise, counterpicketing, heterokaryosises, knowledgeability, leukodystrophies, microearthquakes, pharmacokinetics, phenylketonurias, phenylketonurics, prekindergartens, remarkablenesses, straightjacketed, unskillfulnesses, unthinkabilities
17-letter words
counterblockading, gentlemanlikeness, kaleidoscopically, kindheartednesses, knowledgeableness, persnicketinesses, plainspokennesses, straightjacketing, triskaidekaphobia
18-letter words
cantankerousnesses, gedankenexperiment, knowledgeabilities, triskaidekaphobias
19-letter words
gedankenexperiments, gentlemanlikenesses, knowledgeablenesses, phosphofructokinase
20-letter words
buckminsterfullerene, keratoconjunctivites, keratoconjunctivitis, phosphofructokinases
21-letter words
buckminsterfullerenes
22-letter words
keratoconjunctivitides, keratoconjunctivitises
Some words that start and end with the letter K are:kayakkickkinfolkkinkkioskknackknapsackknock
Some five letter words ending in k include:slackstackstinkstunktrucktrunk
Some five letter words that start with K are:kabobkapokkaputkayakkazookhakiknavekneelknifeknockkrill
Some compound words that start with K are:keepsakekettledrumkeyboardkeychainkickoffkindheartedknickknackknockoff
Some five letter words that end with K are:blackblinkblockbrickbrinkbrookchickchuckchunkclerkclickclockcluckclunkcrackcrankcreekcrookdrankdrinkdrunkflankflaskfleckflickfrankfreakfriskfrockknockKodakprickquickquirkshirkshookslinkskunksparkstarksteakstickstinkstorkstucktricktruckwhisk
Some six letter words ending in K are:attackdamaskembarkhijackremarkshriekshrink
Smart words that start with K are:keenessknowledgeknow-how
Some words containing k, g, w:knowingtweakingwakingwalkingwhackingwinking
There are many words that begin with "K" if you refer to any type of dictionary it will list some as well as you could google words that begin with K.
Some five letter words that start with K are:kabobkaputkarmakayakkazookelly (green)ketchkhakikiddokinkykioskkittyklutzknackknavekneadkneelknifeknockknollknownkoalakookykrautkrill
Some five letter words that start with K are:kabobkaputkarmakayakkazooketchkhakikiddokinkykioskkittyklutzknackknavekneelknifeknishknockknollknownkoalakookykrillkronakronekudzukayak
kachinakoalaKunaSome words that start with k and end with a:kahunakanakarmakashakavakielbasakleptomaniakoalakwachakwanza