9 letter words:
footposts14,
8 letter words:
footpost13,
7 letter words:
tosspot9,
6 letter words:
spoofs11,
potoos8,
pottos8,
spoots8,
stoops8,
5 letter words:
poofs10,
spoof10,
foots8,
softs8,
tofts8,
poots7,
posts7,
potoo7,
potto7,
potts7,
soops7,
spoot7,
spots7,
stoop7,
stops7,
stopt7,
topos7,
ottos5,
soots5,
stots5,
toots5,
4 letter words:
fops9,
poof9,
foot7,
foss7,
oofs7,
soft7,
toft7,
oops6,
opts6,
poos6,
poot6,
poss6,
post6,
pots6,
pott6,
psst6,
soop6,
sops6,
spot6,
stop6,
topo6,
tops6,
oots4,
otto4,
soot4,
sots4,
stot4,
toot4,
toss4,
tost4,
tots4,
3 letter words:
fop8,
oft6,
oof6,
oop5,
ops5,
opt5,
poo5,
pos5,
pot5,
pst5,
sop5,
top5,
oos3,
oot3,
sos3,
sot3,
too3,
tot3,
2 letter words:
of5,
op4,
po4,
oo2,
os2,
so2,
st2,
to2,
