7 letter words:
unfixes17,
6 letter words:
unisex13,
infuse9,
5 letter words:
fixes15,
unfix15,
nexus12,
nixes12,
unsex12,
fines8,
neifs8,
4 letter words:
nixe11,
enuf7,
fens7,
feus7,
fine7,
fins7,
funs7,
fuse7,
neif7,
seif7,
sine4,
3 letter words:
fix13,
nix10,
sex10,
six10,
xis10,
efs6,
fen6,
fes6,
feu6,
fie6,
fin6,
fun6,
ifs6,
ens3,
ins3,
nus3,
sei3,
sen3,
sin3,
sue3,
sun3,
uns3,
use3,
2 letter words:
ex9,
xi9,
xu9,
ef5,
fe5,
if5,
en2,
es2,
in2,
is2,
ne2,
nu2,
si2,
un2,
us2,