7 letter words:
butting10,
6 letter words:
tubing9,
4 letter words:
bung7,
bint6,
bitt6,
bunt6,
butt6,
ting5,
tung5,
tint4,
unit4,
3 letter words:
big6,
bug6,
gib6,
bin5,
bit5,
bun5,
but5,
nib5,
nub5,
tub5,
gin4,
git4,
gnu4,
gun4,
gut4,
tug4,
nit3,
nut3,
tin3,
tit3,
tui3,
tun3,
tut3,
2 letter words:
bi4,
in2,
it2,
nu2,
ti2,
un2,
ut2,