7 letter words:
creeper11,
5 letter words:
creep9,
crepe9,
peece9,
perce9,
4 letter words:
cepe8,
cere6,
cree6,
epee6,
peer6,
pere6,
pree6,
3 letter words:
cep7,
pec7,
cee5,
pee5,
per5,
pre5,
rec5,
rep5,
ere3,
err3,
ree3,
2 letter words:
pe4,
ee2,
er2,
re2,