5 letter words:
birls7,
blurs7,
burls7,
slurb7,
4 letter words:
birl6,
blur6,
bris6,
brus6,
burl6,
burs6,
libs6,
ribs6,
rubs6,
slub6,
urbs6,
lurs4,
slur4,
3 letter words:
bis5,
bru5,
bur5,
bus5,
lib5,
rib5,
rub5,
sib5,
sub5,
urb5,
lis3,
lur3,
sir3,
sri3,
sui3,
sur3,
2 letter words:
bi4,
is2,
li2,
si2,
ur2,
us2,