5 letter words:
perks11,
treks9,
perst7,
perts7,
prest7,
strep7,
4 letter words:
keps10,
kept10,
perk10,
skep10,
spek10,
erks8,
kest8,
kets8,
sekt8,
serk8,
sker8,
sket8,
trek8,
pert6,
pest6,
pets6,
reps6,
sept6,
spet6,
step6,
erst4,
rest4,
rets4,
tres4,
3 letter words:
kep9,
erk7,
ket7,
tsk7,
per5,
pes5,
pet5,
pre5,
pst5,
rep5,
ers3,
est3,
res3,
ret3,
ser3,
set3,
tes3,
2 letter words:
pe4,
er2,
es2,
et2,
re2,
st2,
te2,