5 letter words:
skiff15,
stiff11,
tiffs11,
4 letter words:
kiff14,
fisk11,
kifs11,
tiff10,
kist8,
kits8,
skit8,
fist7,
fits7,
sift7,
3 letter words:
kif10,
iff9,
kis7,
kit7,
sik7,
ski7,
tsk7,
fit6,
ifs6,
sif6,
its3,
sit3,
tis3,
2 letter words:
ki6,
if5,
is2,
it2,
si2,
st2,
ti2,