5 letter words:
croup9,
cruor7,
4 letter words:
coop8,
coup8,
crop8,
poco8,
poop8,
prop8,
curr6,
poor6,
pour6,
purr6,
roup6,
3 letter words:
cop7,
cup7,
pop7,
pup7,
coo5,
cor5,
cru5,
cur5,
orc5,
poo5,
pro5,
pur5,
roc5,
upo5,
urp5,
our3,
2 letter words:
op4,
up4,
or2,