5 letter words:
ports7,
prost7,
sport7,
strop7,
4 letter words:
opts6,
port6,
post6,
pots6,
pros6,
spot6,
stop6,
tops6,
trop6,
orts4,
rost4,
rots4,
sort4,
tors4,
3 letter words:
ops5,
opt5,
pos5,
pot5,
pro5,
pst5,
sop5,
top5,
ors3,
ort3,
rot3,
sot3,
tor3,
2 letter words:
op4,
po4,
or2,
os2,
so2,
st2,
to2,