5 letter words:
finos8,
foins8,
foist8,
fonts8,
infos8,
4 letter words:
fino7,
fins7,
fist7,
fits7,
foin7,
fons7,
font7,
info7,
sift7,
soft7,
into4,
ions4,
nits4,
snit4,
snot4,
tins4,
tons4,
3 letter words:
fin6,
fit6,
fon6,
ifs6,
oft6,
ins3,
ion3,
its3,
nit3,
nos3,
not3,
ons3,
sin3,
sit3,
son3,
sot3,
tin3,
tis3,
ton3,
2 letter words:
if5,
of5,
in2,
is2,
it2,
no2,
oi2,
on2,
os2,
si2,
so2,
ti2,
to2,