4 letter words:
papa8,
pupa8,
apod7,
dopa7,
doup7,
updo7,
oupa6,
paua6,
3 letter words:
app7,
pap7,
pop7,
pup7,
dap6,
dop6,
dup6,
pad6,
pod6,
pud6,
apo5,
oup5,
poa5,
upo5,
ado4,
duo4,
oda4,
oud4,
udo4,
aua3,
2 letter words:
op4,
pa4,
po4,
up4,
ad3,
da3,
do3,
od3,
aa2,
ou2,