7 letter words:
fittest10,
6 letter words:
feists9,
fittes9,
testis6,
5 letter words:
feist8,
fests8,
fetts8,
fiest8,
fists8,
fitte8,
fitts8,
seifs8,
sifts8,
tifts8,
setts5,
sites5,
stets5,
sties5,
tests5,
4 letter words:
efts7,
feis7,
fess7,
fest7,
fets7,
fett7,
fist7,
fits7,
fitt7,
seif7,
sift7,
tefs7,
tift7,
ests4,
seis4,
sets4,
sett4,
sies4,
sist4,
site4,
sits4,
stet4,
stie4,
test4,
tets4,
ties4,
tite4,
tits4,
3 letter words:
efs6,
eft6,
fes6,
fet6,
fie6,
fit6,
ifs6,
sif6,
tef6,
ess3,
est3,
its3,
sei3,
set3,
sis3,
sit3,
tes3,
tet3,
tie3,
tis3,
tit3,
2 letter words:
ef5,
fe5,
if5,
es2,
et2,
is2,
it2,
si2,
st2,
te2,
ti2,