5 letter words:
orpin7,
prion7,
4 letter words:
prof9,
fino7,
firn7,
foin7,
info7,
pion6,
pirn6,
porn6,
inro4,
iron4,
noir4,
nori4,
3 letter words:
fop8,
fin6,
fir6,
fon6,
for6,
fro6,
rif6,
nip5,
pin5,
poi5,
pro5,
rip5,
ion3,
nor3,
rin3,
2 letter words:
if5,
of5,
op4,
pi4,
in2,
no2,
oi2,
on2,
or2,