5 letter words:
billy10,
bully10,
4 letter words:
buzz24,
zill13,
inby9,
illy7,
inly7,
lily7,
liny7,
luny7,
yill7,
bill6,
blin6,
bull6,
nill4,
null4,
3 letter words:
zuz21,
biz14,
zin12,
buy8,
yin6,
bin5,
bun5,
lib5,
nib5,
nub5,
ill3,
lin3,
nil3,
2 letter words:
by7,
bi4,
in2,
li2,
nu2,
un2,