4 letter words:
fens7,
foen7,
foes7,
fone7,
fons7,
nefs7,
eons4,
noes4,
nose4,
ones4,
sone4,
3 letter words:
efs6,
fen6,
fes6,
foe6,
fon6,
nef6,
ens3,
eon3,
nos3,
oes3,
one3,
ons3,
ose3,
sen3,
son3,
2 letter words:
ef5,
fe5,
of5,
en2,
es2,
ne2,
no2,
oe2,
on2,
os2,
so2,