5 letter words:
infix15,
finis8,
finos8,
foins8,
infos8,
4 letter words:
fino7,
fins7,
foin7,
fons7,
info7,
ions4,
nisi4,
3 letter words:
fix13,
fox13,
nix10,
six10,
sox10,
xis10,
fin6,
fon6,
ifs6,
ins3,
ion3,
nos3,
ons3,
sin3,
son3,
2 letter words:
ox9,
xi9,
if5,
of5,
in2,
is2,
no2,
oi2,
on2,
os2,
si2,
so2,