7 letter words:
prolong10,
6 letter words:
prolog9,
5 letter words:
prong8,
orlop7,
porno7,
logon6,
orlon5,
4 letter words:
glop7,
goop7,
gorp7,
pong7,
prog7,
loop6,
polo6,
pool6,
poon6,
poor6,
porn6,
goon5,
logo5,
long5,
loon4,
lorn4,
nolo4,
3 letter words:
lop5,
pol5,
poo5,
pro5,
goo4,
gor4,
log4,
nog4,
loo3,
noo3,
nor3,
ono3,
2 letter words:
op4,
go3,
lo2,
no2,
on2,
or2,