6 letter words:
frosts9,
5 letter words:
forts8,
frost8,
softs8,
sorts5,
4 letter words:
fort7,
foss7,
soft7,
orts4,
rots4,
sort4,
sots4,
tors4,
toss4,
3 letter words:
for6,
fro6,
oft6,
ors3,
ort3,
rot3,
sos3,
sot3,
tor3,
2 letter words:
of5,
or2,
os2,
so2,
to2,