5 letter words:
coper9,
creep9,
crepe9,
4 letter words:
cepe8,
cope8,
crop8,
cere6,
cero6,
core6,
peer6,
pere6,
pore6,
pree6,
repo6,
rope6,
3 letter words:
cep7,
cop7,
pec7,
cee5,
cor5,
ope5,
orc5,
pee5,
per5,
pro5,
rec5,
rep5,
roc5,
ere3,
ore3,
ree3,
roe3,
2 letter words:
op4,
pe4,
er2,
oe2,
or2,
re2,