6 letter words:
opener8,
pereon8,
reopen8,
5 letter words:
preen7,
prone7,
4 letter words:
expo13,
prex13,
exon11,
oxen11,
neep6,
nope6,
open6,
peen6,
peer6,
peon6,
pere6,
pone6,
pore6,
porn6,
pree6,
repo6,
rope6,
erne4,
3 letter words:
pox12,
rex10,
ope5,
pee5,
pen5,
per5,
pro5,
rep5,
eon3,
ere3,
ern3,
nee3,
nor3,
one3,
ore3,
ree3,
roe3,
2 letter words:
ex9,
ox9,
op4,
pe4,
en2,
er2,
ne2,
no2,
oe2,
on2,
or2,
re2,