5 letter words:
fasts8,
fiats8,
fists8,
sifts8,
satis5,
stats5,
titis5,
4 letter words:
fast7,
fats7,
fiat7,
fist7,
fits7,
sift7,
aits4,
sati4,
sits4,
stat4,
tass4,
tats4,
titi4,
tits4,
3 letter words:
aft6,
fas6,
fat6,
fit6,
ifs6,
ais3,
ait3,
ass3,
att3,
its3,
sat3,
sis3,
sit3,
tas3,
tat3,
tis3,
tit3,
2 letter words:
fa5,
if5,
ai2,
as2,
at2,
is2,
it2,
si2,
ta2,
ti2,