5 letter words:
feint8,
fient8,
often8,
4 letter words:
feen7,
feet7,
feni7,
fent7,
fete7,
fine7,
fino7,
foen7,
foin7,
fone7,
font7,
info7,
neif7,
nief7,
nife7,
eine4,
eten4,
into4,
nete4,
nite4,
note4,
oint4,
onie4,
teen4,
tene4,
tine4,
tone4,
3 letter words:
eft6,
fee6,
fen6,
fet6,
fie6,
fin6,
fit6,
foe6,
fon6,
nef6,
oft6,
tef6,
een3,
ene3,
eon3,
ion3,
nee3,
net3,
nie3,
nit3,
not3,
one3,
tee3,
ten3,
tie3,
tin3,
toe3,
ton3,
2 letter words:
ef5,
fe5,
if5,
of5,
ee2,
en2,
et2,
in2,
io2,
it2,
ne2,
no2,
oe2,
oi2,
on2,
te2,
ti2,
to2,