6 letter words:
proofs11,
5 letter words:
poofs10,
profs10,
proof10,
spoof10,
roofs8,
proso7,
sopor7,
spoor7,
4 letter words:
fops9,
poof9,
prof9,
roof7,
oops6,
poor6,
poos6,
pros6,
3 letter words:
fop8,
for6,
fro6,
ops5,
poo5,
pro5,
sop5,
ors3,
2 letter words:
of5,
op4,
or2,
os2,
so2,