5 letter words:
conin7,
pinon7,
onion5,
4 letter words:
coop8,
poco8,
cion6,
coin6,
coni6,
conn6,
coon6,
icon6,
noop6,
pion6,
poon6,
noni4,
noon4,
3 letter words:
cop7,
pic7,
con5,
coo5,
nip5,
oop5,
pin5,
poi5,
poo5,
inn3,
ion3,
non3,
noo3,
ono3,
oon3,
2 letter words:
op4,
pi4,
po4,
in2,
io2,
no2,
oi2,
on2,
oo2,