5 letter words:
baffs13,
biffs13,
4 letter words:
baff12,
biff12,
fabs9,
fibs9,
bias6,
isba6,
3 letter words:
aff9,
iff9,
fab8,
fib8,
fas6,
ifs6,
sif6,
abs5,
bas5,
bis5,
sab5,
sib5,
ais3,
sai3,
2 letter words:
fa5,
if5,
ab4,
ba4,
bi4,
ai2,
as2,
is2,
si2,