6 letter words:
shifts12,
5 letter words:
shift11,
fists8,
hists8,
shist8,
shits8,
sifts8,
4 letter words:
fish10,
fist7,
fits7,
hiss7,
hist7,
hits7,
shit7,
sift7,
sith7,
this7,
sits4,
3 letter words:
fit6,
his6,
hit6,
ifs6,
its3,
sis3,
sit3,
tis3,
2 letter words:
hi5,
if5,
sh5,
is2,
it2,
si2,
ti2,