5 letter words:
acock13,
crack13,
crock13,
cruck13,
croak11,
occur9,
4 letter words:
cock12,
cark10,
cork10,
rack10,
rock10,
ruck10,
coca8,
croc8,
kora8,
okra8,
raku8,
arco6,
orca6,
3 letter words:
ark7,
auk7,
koa7,
kor7,
oak7,
oka7,
arc5,
car5,
cor5,
cru5,
cur5,
oca5,
orc5,
roc5,
oar3,
ora3,
our3,
2 letter words:
ka6,
ar2,
or2,