5 letter words:
profs10,
4 letter words:
fops9,
prof9,
firs7,
rifs7,
piso6,
pois6,
pros6,
rips6,
sori4,
3 letter words:
fop8,
fir6,
for6,
fro6,
ifs6,
rif6,
ops5,
pis5,
poi5,
pro5,
psi5,
rip5,
sip5,
sop5,
ors3,
sir3,
sri3,
2 letter words:
if5,
of5,
op4,
pi4,
is2,
oi2,
or2,
os2,
si2,
so2,