9 letter words:
butternut11,
6 letter words:
brunet8,
bunter8,
burnet8,
butter8,
nutter6,
untrue6,
5 letter words:
brent7,
brunt7,
brute7,
buret7,
burnt7,
butte7,
butut7,
rebut7,
tuber7,
tuner5,
utter5,
4 letter words:
bent6,
bren6,
brut6,
bunt6,
burn6,
bute6,
butt6,
rube6,
tube6,
unbe6,
nett4,
rent4,
rune4,
runt4,
tent4,
tern4,
tret4,
true4,
tune4,
turn4,
tutu4,
3 letter words:
ben5,
bet5,
bun5,
bur5,
but5,
neb5,
nub5,
reb5,
rub5,
tub5,
urb5,
ern3,
net3,
nut3,
ret3,
rue3,
run3,
rut3,
ten3,
tet3,
tun3,
tut3,
urn3,
ute3,
2 letter words:
be4,
en2,
er2,
et2,
ne2,
nu2,
re2,
un2,
ut2,