8 letter words:
opponent12,
6 letter words:
pennon8,
ponent8,
ponton8,
punnet8,
unopen8,
unpent8,
5 letter words:
netop7,
punto7,
puton7,
unpen7,
nonet5,
tenon5,
tonne5,
4 letter words:
pepo8,
poop8,
pope8,
nope6,
open6,
pent6,
peon6,
poet6,
pone6,
poon6,
pout6,
punt6,
tope6,
topo6,
upon6,
neon4,
none4,
noon4,
note4,
noun4,
onto4,
tone4,
toon4,
tune4,
unto4,
3 letter words:
pep7,
pop7,
pup7,
ope5,
opt5,
pen5,
pet5,
poo5,
pot5,
pun5,
put5,
top5,
tup5,
upo5,
eon3,
net3,
noo3,
not3,
nun3,
nut3,
one3,
ono3,
oot3,
out3,
ten3,
toe3,
ton3,
too3,
tun3,
ute3,
2 letter words:
op4,
pe4,
up4,
en2,
et2,
ne2,
no2,
nu2,
oe2,
on2,
to2,
un2,
ut2,