5 letter words:
pongo8,
4 letter words:
goop7,
pogo7,
pong7,
pung7,
upgo7,
noop6,
noup6,
poon6,
upon6,
goon5,
3 letter words:
gup6,
pug6,
oop5,
oup5,
poo5,
pun5,
upo5,
gnu4,
gon4,
goo4,
gun4,
nog4,
noo3,
ono3,
oon3,
2 letter words:
op4,
po4,
up4,
go3,
gu3,
ug3,
no2,
nu2,
on2,
oo2,
ou2,
un2,