4 letter words:
fine7,
fino7,
foin7,
info7,
neif7,
bine6,
bone6,
boon6,
ebon6,
oboe6,
3 letter words:
fib8,
fob8,
fen6,
fie6,
fin6,
foe6,
fon6,
ben5,
bin5,
bio5,
boo5,
neb5,
nib5,
nob5,
obe5,
obi5,
eon3,
ion3,
noo3,
one3,
ono3,
2 letter words:
ef5,
fe5,
if5,
of5,
be4,
bi4,
bo4,
en2,
in2,
ne2,
no2,
oe2,
oi2,
on2,