5 letter words:
forts8,
frost8,
rorts5,
torrs5,
4 letter words:
fort7,
fros7,
orfs7,
soft7,
orts4,
rort4,
rost4,
rots4,
sort4,
torr4,
tors4,
3 letter words:
for6,
fro6,
oft6,
orf6,
ors3,
ort3,
rot3,
sot3,
tor3,
2 letter words:
of5,
or2,
os2,
so2,
st2,
to2,