5 letter words:
prone7,
prune7,
rouen5,
4 letter words:
nope6,
open6,
peon6,
pone6,
pore6,
porn6,
pour6,
pure6,
repo6,
rope6,
roup6,
upon6,
euro4,
roue4,
rune4,
3 letter words:
ope5,
pen5,
per5,
pro5,
pun5,
pur5,
rep5,
upo5,
urp5,
eon3,
ern3,
nor3,
one3,
ore3,
our3,
roe3,
rue3,
run3,
urn3,
2 letter words:
op4,
pe4,
up4,
en2,
er2,
ne2,
no2,
nu2,
oe2,
on2,
or2,
re2,
un2,