7 letter words:
popping14,
pupping14,
6 letter words:
oppugn11,
popgun11,
upping11,
5 letter words:
pinup9,
gipon8,
oping8,
pingo8,
4 letter words:
ping7,
pong7,
pung7,
pion6,
upon6,
3 letter words:
pip7,
pop7,
pup7,
gip6,
pig6,
pug6,
nip5,
pin5,
piu5,
poi5,
pun5,
upo5,
gin4,
gnu4,
gun4,
nog4,
ion3,
2 letter words:
op4,
pi4,
up4,
go3,
in2,
no2,
nu2,
oi2,
on2,
un2,