8 letter words:
billbugs13,
7 letter words:
billbug12,
bulbils11,
6 letter words:
bulbil10,
5 letter words:
blubs9,
bulbs9,
bills7,
bulls7,
gills6,
gulls6,
iglus6,
4 letter words:
bibs8,
blub8,
bubs8,
bulb8,
sibb8,
bigs7,
bugs7,
gibs7,
glib7,
bill6,
bull6,
libs6,
slub6,
gill5,
gull5,
guls5,
iglu5,
lugs5,
slug5,
ills4,
sill4,
3 letter words:
bib7,
bub7,
big6,
bug6,
gib6,
bis5,
bus5,
lib5,
sib5,
sub5,
gul4,
lug4,
ill3,
lis3,
2 letter words:
bi4,
is2,
li2,
si2,
us2,
