7 letter words:
bebeeru11,
6 letter words:
burgee9,
5 letter words:
rebbe9,
grebe8,
4 letter words:
burb8,
berg7,
burg7,
grub7,
beer6,
bree6,
rube6,
eger5,
gree5,
grue5,
urge5,
3 letter words:
bub7,
ebb7,
beg6,
bug6,
bee5,
bur5,
reb5,
rub5,
urb5,
erg4,
gee4,
reg4,
rug4,
ere3,
ree3,
rue3,
2 letter words:
be4,
er2,
re2,