5 letter words:
cribs9,
curbs9,
scrub9,
brigs8,
burgs8,
grubs8,
4 letter words:
crib8,
cubs8,
curb8,
bigs7,
brig7,
bugs7,
burg7,
cigs7,
gibs7,
grub7,
bris6,
burs6,
cris6,
crus6,
curs6,
ibis6,
ribs6,
rubs6,
urbs6,
uric6,
rigs5,
rugs5,
iris4,
3 letter words:
cub7,
big6,
bug6,
cig6,
gib6,
bis5,
bur5,
bus5,
cis5,
cru5,
cur5,
rib5,
rub5,
sib5,
sic5,
sub5,
urb5,
rig4,
rug4,
sir3,
sri3,
2 letter words:
bi4,
is2,
si2,
us2,