4 letter words:
bozo15,
zobo15,
zoon13,
fini7,
fino7,
foin7,
info7,
boon6,
3 letter words:
fiz15,
biz14,
zin12,
zoo12,
fib8,
fob8,
fin6,
fon6,
oof6,
bin5,
bio5,
boi5,
bon5,
boo5,
nib5,
nob5,
obi5,
obo5,
ion3,
noo3,
ono3,
oon3,
2 letter words:
zo11,
if5,
of5,
bi4,
bo4,
ob4,
in2,
io2,
no2,
oi2,
on2,
oo2,