6 letter words:
burgee9,
burger9,
regret7,
ureter6,
5 letter words:
beget8,
grebe8,
beret7,
brute7,
buret7,
rebut7,
tuber7,
egret6,
greet6,
urger6,
truer5,
4 letter words:
berg7,
burg7,
grub7,
beer6,
beet6,
bree6,
brut6,
burr6,
bute6,
rube6,
tube6,
eger5,
gree5,
grue5,
trug5,
urge5,
rete4,
ruer4,
tree4,
true4,
3 letter words:
beg6,
bug6,
bee5,
bet5,
brr5,
bur5,
but5,
reb5,
rub5,
tub5,
urb5,
erg4,
gee4,
get4,
gut4,
reg4,
rug4,
teg4,
tug4,
ere3,
err3,
ree3,
ret3,
rue3,
rut3,
tee3,
ute3,
2 letter words:
be4,
er2,
et2,
re2,
ut2,