6 letter words:
inborn8,
ronion6,
5 letter words:
boron7,
robin7,
onion5,
4 letter words:
biro6,
boon6,
boor6,
born6,
brin6,
brio6,
broo6,
inro4,
iron4,
noir4,
noon4,
nori4,
3 letter words:
bin5,
bio5,
boo5,
bro5,
nib5,
nob5,
obi5,
orb5,
rib5,
rob5,
inn3,
ion3,
noo3,
nor3,
ono3,
rin3,
2 letter words:
bi4,
bo4,
in2,
no2,
oi2,
on2,
or2,