7 letter words:
prolong10,
6 letter words:
burgoo9,
oblong9,
progun9,
prolog9,
5 letter words:
bloop9,
bongo8,
bourg8,
brung8,
group8,
prong8,
boron7,
bourn7,
orlop7,
porno7,
gluon6,
logon6,
orlon5,
4 letter words:
burp8,
blog7,
bong7,
bung7,
burg7,
glob7,
glop7,
gobo7,
goop7,
gorp7,
grub7,
gulp7,
plug7,
pong7,
prog7,
pung7,
blur6,
bolo6,
boon6,
boor6,
born6,
broo6,
burl6,
burn6,
lobo6,
loop6,
loup6,
obol6,
polo6,
pool6,
poon6,
poor6,
porn6,
pour6,
purl6,
roup6,
upon6,
goon5,
logo5,
long5,
lung5,
rung5,
loon4,
lorn4,
lour4,
nolo4,
nurl4,
3 letter words:
bop7,
pub7,
bog6,
bug6,
gob6,
pug6,
boo5,
bro5,
bun5,
bur5,
lob5,
lop5,
nob5,
nub5,
orb5,
pol5,
poo5,
pro5,
pul5,
pun5,
pur5,
rob5,
rub5,
upo5,
urb5,
urp5,
gnu4,
goo4,
gor4,
gul4,
gun4,
log4,
lug4,
nog4,
rug4,
loo3,
noo3,
nor3,
ono3,
our3,
run3,
urn3,
2 letter words:
bo4,
op4,
up4,
go3,
lo2,
no2,
nu2,
on2,
or2,
un2,