6 letter words:
bittur8,
turbit8,
5 letter words:
britt7,
bruit7,
4 letter words:
brig7,
burg7,
grub7,
bitt6,
brit6,
brut6,
butt6,
girt5,
grit5,
trig5,
trug5,
ritt4,
3 letter words:
big6,
bug6,
gib6,
gub6,
bit5,
bru5,
bur5,
but5,
rib5,
rub5,
tub5,
urb5,
git4,
gur4,
gut4,
rig4,
rug4,
tig4,
tug4,
rit3,
rut3,
tit3,
tui3,
tut3,
2 letter words:
bi4,
gi3,
gu3,
ug3,
it2,
ti2,
ur2,
ut2,