5 letter words:
bourg8,
brung8,
bourn7,
4 letter words:
bong7,
bung7,
burg7,
grub7,
born6,
burn6,
guru5,
rung5,
3 letter words:
guv7,
vug7,
bog6,
bug6,
gob6,
bro5,
bun5,
bur5,
nob5,
nub5,
orb5,
rob5,
rub5,
urb5,
gnu4,
gor4,
gun4,
nog4,
rug4,
nor3,
our3,
run3,
urn3,
2 letter words:
bo4,
go3,
no2,
nu2,
on2,
or2,
un2,