4 letter words:
pfft12,
puff12,
teff10,
tuff10,
enuf7,
pent6,
punt6,
tune4,
3 letter words:
eff9,
eft6,
fen6,
fet6,
feu6,
fun6,
pen5,
pet5,
pun5,
put5,
tup5,
net3,
nut3,
ten3,
tun3,
ute3,
2 letter words:
ef5,
fe5,
pe4,
up4,
en2,
et2,
ne2,
nu2,
un2,
ut2,