7 letter words:
creeper11,
6 letter words:
pecker14,
keeper12,
reperk12,
reeker10,
5 letter words:
creek11,
kreep11,
creep9,
crepe9,
4 letter words:
zerk17,
prez15,
peck12,
keep10,
peek10,
peke10,
perk10,
reck10,
cepe8,
reek8,
cere6,
epee6,
peer6,
pere6,
pree6,
3 letter words:
zek16,
zep14,
zee12,
kep9,
cep7,
eek7,
eke7,
pec7,
cee5,
pee5,
per5,
rec5,
rep5,
ere3,
err3,
ree3,
2 letter words:
pe4,
er2,
re2,