5 letter words:
roost5,
roots5,
rotos5,
stoor5,
toros5,
torso5,
4 letter words:
oots4,
orts4,
roos4,
root4,
rost4,
roto4,
rots4,
soot4,
sort4,
toro4,
tors4,
3 letter words:
oor3,
oos3,
oot3,
ors3,
ort3,
roo3,
rot3,
sot3,
too3,
tor3,
2 letter words:
oo2,
or2,
os2,
so2,
st2,
to2,