7 letter words:
fibroin12,
6 letter words:
bowfin14,
fibrin11,
5 letter words:
frown11,
brown10,
boron7,
oribi7,
robin7,
4 letter words:
frow10,
woof10,
brow9,
forb9,
fino7,
firn7,
foin7,
info7,
roof7,
wino7,
worn7,
biro6,
boon6,
boor6,
born6,
brin6,
brio6,
broo6,
inro4,
iron4,
noir4,
nori4,
3 letter words:
bow8,
fib8,
fob8,
fin6,
fir6,
fon6,
for6,
fro6,
now6,
own6,
rif6,
row6,
win6,
won6,
woo6,
bin5,
bio5,
boo5,
bro5,
nib5,
nob5,
obi5,
orb5,
rib5,
rob5,
ion3,
noo3,
nor3,
ono3,
rin3,
2 letter words:
if5,
of5,
ow5,
wo5,
bi4,
bo4,
in2,
no2,
oi2,
on2,
or2,