8 letter words:
gonopore11,
6 letter words:
operon8,
orgone7,
5 letter words:
grope8,
pengo8,
prong8,
porno7,
prone7,
genro6,
goner6,
4 letter words:
goop7,
gorp7,
pong7,
prog7,
nope6,
open6,
peon6,
pone6,
poon6,
poor6,
pore6,
porn6,
repo6,
rope6,
ergo5,
goer5,
gone5,
goon5,
gore5,
ogre5,
3 letter words:
peg6,
ope5,
pen5,
per5,
poo5,
pro5,
rep5,
ego4,
eng4,
erg4,
gen4,
goo4,
gor4,
neg4,
nog4,
reg4,
eon3,
ern3,
noo3,
nor3,
one3,
ono3,
ore3,
roe3,
2 letter words:
op4,
pe4,
go3,
en2,
er2,
ne2,
no2,
oe2,
on2,
or2,
re2,
