9 letter words:
bilirubin13,
5 letter words:
blurb9,
blini7,
bruin7,
burin7,
libri7,
rubin7,
4 letter words:
blub8,
bulb8,
burb8,
birl6,
blin6,
blur6,
brin6,
burl6,
burn6,
liri4,
nirl4,
nurl4,
ruin4,
3 letter words:
bib7,
bub7,
bin5,
bru5,
bun5,
bur5,
lib5,
nib5,
nub5,
rib5,
rub5,
urb5,
lin3,
lur3,
nil3,
nur3,
rin3,
run3,
uni3,
urn3,
2 letter words:
bi4,
in2,
li2,
nu2,
un2,
ur2,