5 letter words:
feist8,
piste7,
spite7,
stipe7,
4 letter words:
efts7,
fest7,
fets7,
fist7,
fits7,
seif7,
sift7,
pest6,
pets6,
pies6,
pits6,
sept6,
sipe6,
spit6,
step6,
tips6,
site4,
ties4,
3 letter words:
efs6,
eft6,
fes6,
fet6,
fie6,
fit6,
ifs6,
pes5,
pet5,
pie5,
pis5,
pit5,
psi5,
pst5,
sip5,
tip5,
its3,
sei3,
set3,
sit3,
tie3,
tis3,
2 letter words:
ef5,
fe5,
if5,
pe4,
pi4,
es2,
et2,
is2,
it2,
si2,
ti2,