7 letter words:
boiloff15,
5 letter words:
boffo13,
folio8,
oboli7,
4 letter words:
biff12,
boff12,
filo7,
foil7,
fool7,
loof7,
boil6,
bolo6,
lobo6,
obol6,
olio4,
3 letter words:
iff9,
off9,
fib8,
fob8,
fil6,
bio5,
boo5,
lib5,
lob5,
obi5,
loo3,
oil3,
2 letter words:
if5,
of5,
bi4,
bo4,
li2,
lo2,
oi2,
