5 letter words:
prank11,
krona9,
apron7,
4 letter words:
knap10,
knop10,
park10,
pork10,
kaon8,
karn8,
knar8,
koan8,
kora8,
nark8,
okra8,
rank8,
porn6,
prao6,
proa6,
roan4,
3 letter words:
kop9,
ark7,
koa7,
kor7,
oak7,
oka7,
apo5,
nap5,
pan5,
par5,
pro5,
rap5,
nor3,
oar3,
ora3,
ran3,
2 letter words:
ka6,
op4,
pa4,
an2,
ar2,
na2,
no2,
on2,
or2,