5 letter words:
opine7,
4 letter words:
nope6,
open6,
pein6,
peni6,
peon6,
pine6,
pion6,
pone6,
onie4,
3 letter words:
nep5,
nip5,
ope5,
pen5,
pie5,
pin5,
poi5,
eon3,
ion3,
nie3,
one3,
2 letter words:
op4,
pe4,
pi4,
po4,
en2,
in2,
io2,
ne2,
no2,
oe2,
oi2,
on2,