6 letter words:
rubigo9,
5 letter words:
bourg8,
broil7,
guiro6,
4 letter words:
biog7,
blog7,
brig7,
burg7,
glib7,
glob7,
grub7,
birl6,
biro6,
blur6,
boil6,
brio6,
burl6,
girl5,
giro5,
iglu5,
lour4,
roil4,
3 letter words:
big6,
bog6,
bug6,
gib6,
gob6,
bio5,
bro5,
bur5,
lib5,
lob5,
obi5,
orb5,
rib5,
rob5,
rub5,
urb5,
gor4,
gul4,
log4,
lug4,
rig4,
rug4,
oil3,
our3,
2 letter words:
bi4,
bo4,
go3,
li2,
lo2,
oi2,
or2,