ARC - A directed edge.
CAN - To know how to; to be able to.
CAR - A wheeled vehicle, drawn by a horse or other animal.
CON - To study, especially in order to gain knowledge of.
OAR - An implement used to propel a boat or a ship in the water, having a flat blade at one end, being rowed from the other end and being normally fastened to the vessel.
RAN - Simple past of run.
COO - The murmuring sound made by a dove or pigeon.
CORN - A cereal plant grown for its grain, specifically the main such plant grown in a given region, such as oats in parts of Scotland and Ireland, wheat or barley in England and Wales, and maize or sweetcorn in the Americas.
COCO - Coconut palm.
CROC - A crocodile.
ORCA - A sea mammal (scientific name: Orcinus orca) related to dolphins and porpoises, commonly called the killer whale.
ROAN - Especially of a horse, having a coat of a dark base color with individual white hairs mixed in.
ACORN - The fruit of the oak, being an oval nut growing in a woody cup or cupule.
COCOA - The dried and partially fermented fatty seeds of the cacao tree from which chocolate is made.
CROON - To hum or sing softly or in a sentimental manner.
CORONA - A crown or garland bestowed among the Romans as a reward for distinguished services.
RACOON - Alternative spelling of raccoon.
RACCOON - A nocturnal omnivore originally living in North America, typically with a mixture of gray, brown, and black fur, a mask-like marking around the eyes and a striped tail; Procyon lotor.