Here are some possible words:
calcspar
calendar
calender
calliper
callower
cameleer
canaller
canceler
candider
canister
canvaser
capabler
capmaker
capsular
capturer
careener
careerer
caresser
carmaker
caroller
carouser
catchier
catheter
catnaper
cavalier
caveator
caviller
cavorter
cellarer
cellular
cementer
censurer
chaffier
chalkier
chancier
chandler
charrier
chattier
chauffer
cheekier
cheerier
cheesier
chelator
chertier
chestier
chicaner
chillier
chinkier
chirpier
chiseler
choosier
choppier
chortler
chubbier
chuckler
chummier
chunkier
cinnabar
circular
cislunar
clammier
clamorer
clangour
classier
cleanser
cleverer
cliffier
clincher
clingier
cliquier
cloddier
cloggier
cloister
clothier
cloudier
clubbier
clumpier
clumsier
coauthor
cochlear
codifier
coeditor
cognizer
coiffeur
colander
colinear
collator
colleger
colluder
colourer
columnar
combater
combiner
comelier
commoner
commuter
comparer
compiler
complier
composer
computer
conceder
conciser
condoler
condoner
conducer
confider
confiner
confuter
congener
conjurer
conjuror
conniver
consider
consoler
consular
consumer
convener
conveyer
conveyor
convoker
coplanar
corridor
corroder
cosigner
costlier
costumer
cottager
courtier
couthier
coworker
crabbier
craftier
craggier
crankier
crappier
crawlier
creakier
creamier
creasier
creditor
creepier
cremator
crimpier
crippler
crispier
croakier
crossbar
croupier
crucifer
crueller
crumbier
crummier
cruncher
crusader
crustier
cucumber
cuddlier
cudgeler
cultivar
cumberer
curseder
cuspidor
customer
cutesier
cyclecar
cylinder
cymbaler
Some six letter words that start with W and end with R are:waiterwaiverwalkerwanderwasherweaverwelderwelterwickerwinnerwinterwitherwooferwriter
abductabruptabsentacceptacquitadjustadventadvertalmostamountanointarrestaspectassistattest
curfew
Six letter words that start and end with R:rafterraiderrancorrangerrapierraptorrasherratherreaderreaperrectorreeferrenderrenterrepairricherrigourringerripperrobberrockerrollerromperrooferrosterrubberrudderrunner
Six letter words that start with I and end with P are icecap and instep.
nan-lit
Six letter words that end with H:AmbushAttachAweighBanishBleachBlotchBluishBoyishBranchBreachBreathBreechBroachBroochBrunchCaliphChurchClinchClutchCrotchCrouchCrunchCrutchDanishDearthDetachDrenchFamishFetishFinishFlinchFourthFrenchGarishGlitchGrinchGrouchGrowthHaunchHealthHearthImpishKiboshKirschKitschLaunchLavishLengthLoofahLowishMenschModishMopishMulishNewishOnrushOwlishPariahParishPaunchPerishPlinthPloughPolishPreachPunishQuenchRadishRavishRelishRewashScorchScotchSearchSeraphSheathSketchSleighSleuthSlouchSnitchSpeechSplashSquashSquishStarchStenchStitchSwatchSwitchSwooshThatchThoughThrashThrushTrenchTroughTwitchVanishWarmthWealthWhooshWraithWreathWrenchZenith
Six (6) letter words that end with on:actionbaboonbeacon.beckon.bonbonbunionbuttoncannoncanyoncarboncartoncitroncocooncommoncottoncouponcrayondaikon.deacon.dragonepigon.falconflagonfusiongabion.gallongibbon.guidon.hagdon.jargonlagoonlegionlesionlessonlotionmaroonmatronmicronminionmotionmuttonnationneuronnotionoptionpardonparsonpatronpersonphotonpigeon.pistonpoison.potionprisonprotonpythonrationreasonreckonregionribbonsalmonsaloonseasonsermonsiphonsummontendontycoonunisonvisionwantonweapon.won tonzircon
There are no 6 letter words that end in COP.
There are no English words ending in "-six", let alone six letter words.
A six letter word is regain.
cosmic, delved, entire, giving, health, lintel, rotter, sparks, willow.