4 letter words:
mope8,
moup8,
poem8,
pome8,
meno6,
menu6,
meou6,
moue6,
muon6,
neum6,
nome6,
nope6,
noup6,
omen6,
open6,
peon6,
pone6,
upon6,
3 letter words:
mop7,
pom7,
ump7,
emo5,
emu5,
men5,
meu5,
moe5,
mon5,
mou5,
mun5,
nep5,
nom5,
ope5,
oup5,
pen5,
pun5,
upo5,
eon3,
one3,
2 letter words:
em4,
me4,
mo4,
mu4,
om4,
op4,
pe4,
po4,
um4,
up4,
en2,
ne2,
no2,
nu2,
oe2,
on2,
ou2,
un2,