7 letter words:
buggier11,
6 letter words:
bigger10,
bugger10,
5 letter words:
giber8,
gigue7,
gurge7,
4 letter words:
berg7,
brig7,
burg7,
gibe7,
grub7,
bier6,
brie6,
grig6,
rube6,
grue5,
urge5,
3 letter words:
beg6,
big6,
bug6,
gib6,
bur5,
egg5,
gig5,
igg5,
reb5,
rib5,
rub5,
urb5,
erg4,
gie4,
reg4,
rig4,
rug4,
ire3,
rei3,
rue3,
2 letter words:
be4,
bi4,
er2,
re2,