5 letter words:
spiff13,
fiefs11,
fifes11,
stiff11,
teffs11,
tiffs11,
feist8,
fiest8,
piets7,
piste7,
spite7,
stipe7,
4 letter words:
pfft12,
effs10,
fief10,
fife10,
teff10,
tiff10,
spif9,
efts7,
feis7,
fest7,
fets7,
fist7,
fits7,
seif7,
sift7,
tefs7,
pest6,
pets6,
pies6,
piet6,
pise6,
pits6,
sept6,
sipe6,
spet6,
spie6,
spit6,
step6,
tips6,
site4,
stie4,
ties4,
3 letter words:
eff9,
iff9,
efs6,
eft6,
fes6,
fet6,
fie6,
fit6,
ifs6,
sif6,
tef6,
pes5,
pet5,
pie5,
pis5,
pit5,
psi5,
pst5,
sip5,
tip5,
est3,
its3,
sei3,
set3,
sit3,
tes3,
tie3,
tis3,
2 letter words:
ef5,
fe5,
if5,
pe4,
pi4,
es2,
et2,
is2,
it2,
si2,
st2,
te2,
ti2,