6 letter words:
tergum9,
5 letter words:
begum10,
brume9,
umber9,
grume8,
brute7,
buret7,
muter7,
rebut7,
tuber7,
4 letter words:
berm8,
berg7,
burg7,
germ7,
geum7,
grub7,
grum7,
brut6,
bute6,
mure6,
mute6,
rube6,
term6,
tube6,
grue5,
guru5,
trug5,
urge5,
true4,
3 letter words:
bum7,
beg6,
bug6,
gem6,
gum6,
meg6,
mug6,
bet5,
bur5,
but5,
emu5,
met5,
mut5,
reb5,
rem5,
rub5,
rum5,
tub5,
urb5,
erg4,
get4,
gut4,
reg4,
rug4,
teg4,
tug4,
ret3,
rue3,
rut3,
ute3,
2 letter words:
be4,
em4,
me4,
mu4,
um4,
er2,
et2,
re2,
ut2,