5 letter words:
feint8,
often8,
4 letter words:
feet7,
fete7,
fine7,
fino7,
foin7,
font7,
info7,
neif7,
into4,
nite4,
note4,
teen4,
tine4,
tone4,
3 letter words:
eft6,
fee6,
fen6,
fet6,
fie6,
fin6,
fit6,
foe6,
fon6,
oft6,
eon3,
ion3,
nee3,
net3,
nit3,
not3,
one3,
tee3,
ten3,
tie3,
tin3,
toe3,
ton3,
2 letter words:
ef5,
fe5,
if5,
of5,
en2,
et2,
in2,
it2,
ne2,
no2,
oe2,
oi2,
on2,
ti2,
to2,