5 letter words:
croze16,
creek11,
ocker11,
4 letter words:
zerk17,
zero13,
coke10,
cork10,
reck10,
rock10,
kore8,
reek8,
cere6,
cero6,
core6,
3 letter words:
zek16,
coz14,
zee12,
eek7,
eke7,
kor7,
oke7,
cee5,
cor5,
orc5,
rec5,
roc5,
ere3,
ore3,
ree3,
roe3,
2 letter words:
er2,
oe2,
or2,
re2,