5 letter words:
fibro10,
4 letter words:
forb9,
frib9,
roof7,
biro6,
boor6,
brio6,
broo6,
3 letter words:
fib8,
fob8,
fir6,
for6,
fro6,
oof6,
orf6,
rif6,
bio5,
boi5,
boo5,
bor5,
bro5,
obi5,
obo5,
orb5,
rib5,
rob5,
oor3,
roo3,
2 letter words:
if5,
of5,
bi4,
bo4,
ob4,
io2,
oi2,
oo2,
or2,