4 letter words:
kipp12,
pork10,
pouk10,
koru8,
kuri8,
prop8,
ripp8,
pour6,
puir6,
puri6,
roup6,
3 letter words:
kip9,
kop9,
irk7,
kir7,
koi7,
kor7,
oik7,
ouk7,
pip7,
pop7,
pup7,
rok7,
oup5,
pir5,
piu5,
poi5,
pro5,
pur5,
rip5,
upo5,
urp5,
our3,
2 letter words:
ki6,
ko6,
op4,
pi4,
po4,
up4,
io2,
oi2,
or2,
ou2,
ur2,