5 letter words:
brock13,
croak11,
carbo9,
carob9,
cobra9,
4 letter words:
back12,
bock12,
bark10,
bork10,
cark10,
cork10,
kbar10,
rack10,
rock10,
carb8,
crab8,
kora8,
okra8,
arco6,
boar6,
bora6,
orca6,
3 letter words:
kab9,
kob9,
ark7,
cab7,
cob7,
koa7,
kor7,
oak7,
oka7,
abo5,
arb5,
arc5,
bar5,
boa5,
bra5,
bro5,
car5,
cor5,
oba5,
oca5,
orb5,
orc5,
rob5,
roc5,
oar3,
ora3,
2 letter words:
ka6,
ab4,
ba4,
bo4,
ar2,
or2,