According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 101 words with the pattern ---K-S. That is, six letter words with 4th letter K and 6th letter S. In alphabetical order, they are:
abakas
adukis
atokes
awakes
azukis
babkas
beckes
blokes
brakes
brokes
bubkes
buckos
buckus
bunkos
bupkes
bupkus
burkas
burkes
chekas
chokes
chokos
clokes
crakes
deckos
dekkos
dirkes
donkos
drakes
dukkas
enokis
evokes
faikes
flakes
flukes
geckos
glikes
grikes
grykes
haikus
hookas
irokos
jockos
kaikas
khakis
laikas
latkes
maikos
markas
mekkas
milkos
minkes
nerkas
ozekis
padkos
palkis
parkas
parkis
peckes
pinkos
poakas
poakes
polkas
pookas
poukes
prokes
pulkas
punkas
quakes
rankes
reikis
ruckus
sakkos
sankos
shakes
shakos
sickos
slakes
smokes
smokos
snakes
snokes
spikes
spokes
stakes
stokes
sukkos
tankas
tikkas
trikes
trokes
trykes
turkis
vodkas
wackes
wackos
weekes
welkes
wukkas
yackas
yakkas
zinkes
There is no such word in English language.
O'Keefe
Some six letter words:first and fourth letter is the samesecond and sixth letter being the same:BalboaBeebeeBoobooCanchaCoocooIndignKeckleMuumuuPeopleTantraTeetheTentieTestaeTestee
people
statute
statute
Lavagenewerezitigaladatapolosolotutuguru
kayak and level
reversed
benefitsfanaticalfinishedgeneralsgenerategeneroushonoraryminicampmonogamymonogrammonoxidemonorailrenegaderenewalssinistertenementvenerate
dividing
reversed
array
Pepper