5 letter words:
apron7,
raupo7,
upran7,
4 letter words:
noup6,
oupa6,
porn6,
pour6,
prao6,
prau6,
proa6,
puna6,
roup6,
upon6,
ourn4,
raun4,
roan4,
urao4,
3 letter words:
apo5,
nap5,
oup5,
pan5,
par5,
poa5,
pro5,
pun5,
pur5,
rap5,
upo5,
urp5,
nor3,
nur3,
oar3,
ora3,
our3,
ran3,
run3,
urn3,
2 letter words:
op4,
pa4,
po4,
up4,
an2,
ar2,
na2,
no2,
nu2,
on2,
or2,
ou2,
un2,
ur2,