6 letter words:
rubigo9,
5 letter words:
bourg8,
group8,
pirog8,
guiro6,
4 letter words:
burp8,
biog7,
brig7,
burg7,
gorp7,
grip7,
grub7,
prig7,
prog7,
biro6,
brio6,
pour6,
puri6,
roup6,
giro5,
3 letter words:
bop7,
pub7,
big6,
bog6,
bug6,
gib6,
gip6,
gob6,
pig6,
pug6,
bio5,
bro5,
bur5,
obi5,
orb5,
piu5,
poi5,
pro5,
pur5,
rib5,
rip5,
rob5,
rub5,
upo5,
urb5,
urp5,
gor4,
rig4,
rug4,
our3,
2 letter words:
bi4,
bo4,
op4,
pi4,
up4,
go3,
oi2,
or2,