8 letter words:
grubbing14,
7 letter words:
rubbing12,
6 letter words:
buggin10,
gruing8,
urging8,
5 letter words:
bring8,
brung8,
bruin7,
burin7,
rubin7,
ruing6,
unrig6,
4 letter words:
bigg8,
burb8,
bing7,
brig7,
bung7,
burg7,
grub7,
brin6,
burn6,
ging6,
grig6,
gung6,
rigg6,
girn5,
grin5,
gurn5,
ring5,
rung5,
ruin4,
3 letter words:
bib7,
bub7,
big6,
bug6,
gib6,
gub6,
bin5,
bru5,
bun5,
bur5,
gig5,
igg5,
nib5,
nub5,
rib5,
rub5,
urb5,
gin4,
gnu4,
gun4,
gur4,
rig4,
rug4,
nur3,
rin3,
run3,
uni3,
urn3,
2 letter words:
bi4,
gi3,
gu3,
ug3,
in2,
nu2,
un2,
ur2,
