5 letter words:
puker11,
4 letter words:
kerf11,
perk10,
puke10,
puer6,
pure6,
3 letter words:
kef10,
kep9,
erk7,
euk7,
kue7,
uke7,
erf6,
fer6,
feu6,
fur6,
ref6,
per5,
pre5,
pur5,
rep5,
urp5,
rue3,
ure3,
2 letter words:
ef5,
fe5,
pe4,
up4,
er2,
re2,
ur2,