5 letter words:
croup9,
curio7,
4 letter words:
coup8,
crop8,
prop8,
pupu8,
coir6,
pour6,
puri6,
roup6,
uric6,
3 letter words:
cop7,
cup7,
pic7,
pip7,
pop7,
pup7,
cor5,
cru5,
cur5,
orc5,
piu5,
poi5,
pro5,
pur5,
rip5,
roc5,
upo5,
urp5,
our3,
2 letter words:
op4,
pi4,
up4,
oi2,
or2,