6 letter words:
keeper12,
keener10,
5 letter words:
kreep11,
kerne9,
preen7,
4 letter words:
keep10,
peek10,
peke10,
perk10,
keen8,
kern8,
knee8,
reek8,
epee6,
neep6,
peen6,
peer6,
pere6,
pree6,
erne4,
3 letter words:
kep9,
eek7,
eke7,
ken7,
pee5,
pen5,
per5,
rep5,
ere3,
ern3,
nee3,
ree3,
2 letter words:
pe4,
en2,
er2,
ne2,
re2,