5 letter words:
apoop9,
napoo7,
4 letter words:
oppo8,
poop8,
pupa8,
noop6,
noup6,
oupa6,
poon6,
puna6,
upon6,
anno4,
anon4,
nona4,
noon4,
noun4,
3 letter words:
app7,
pap7,
pop7,
pup7,
apo5,
nap5,
oop5,
oup5,
pan5,
poa5,
poo5,
pun5,
upo5,
ann3,
nan3,
non3,
noo3,
nun3,
ono3,
oon3,
2 letter words:
op4,
pa4,
po4,
up4,
an2,
na2,
no2,
nu2,
on2,
oo2,
ou2,
un2,