5 letter words:
sniff11,
finos8,
foins8,
infos8,
4 letter words:
offs10,
fino7,
fins7,
foin7,
fons7,
info7,
ions4,
3 letter words:
iff9,
off9,
fin6,
fon6,
ifs6,
ins3,
ion3,
nos3,
ons3,
sin3,
son3,
2 letter words:
if5,
of5,
in2,
is2,
no2,
oi2,
on2,
os2,
si2,
so2,