4 letter words:
moop8,
moup8,
pomo8,
mono6,
moon6,
muon6,
noop6,
noup6,
poon6,
upon6,
noon4,
noun4,
3 letter words:
mop7,
pom7,
ump7,
mon5,
moo5,
mou5,
mun5,
nom5,
oom5,
oop5,
oup5,
poo5,
pun5,
upo5,
non3,
noo3,
nun3,
ono3,
oon3,
2 letter words:
mo4,
mu4,
om4,
op4,
po4,
um4,
up4,
no2,
nu2,
on2,
oo2,
ou2,
un2,