9 letter words:
fibriform19,
6 letter words:
biform13,
5 letter words:
biffo13,
fibro10,
oribi7,
4 letter words:
biff12,
boff12,
miff12,
fifi10,
riff10,
firm9,
forb9,
form9,
frib9,
from9,
borm8,
brim8,
biro6,
birr6,
brio6,
miri6,
miro6,
3 letter words:
iff9,
off9,
fib8,
fob8,
mib7,
mob7,
fir6,
for6,
fro6,
orf6,
rif6,
bio5,
boi5,
bor5,
bro5,
brr5,
mir5,
moi5,
mor5,
obi5,
orb5,
rib5,
rim5,
rob5,
rom5,
2 letter words:
if5,
of5,
bi4,
bo4,
mi4,
mo4,
ob4,
om4,
io2,
oi2,
or2,