Beaver

a hat made with the fur of a beaver (or similar material)

a man's hat with a tall crown; usually covered with silk or with beaver fur

the soft brown fur of the beaver

a native or resident of Oregon

a full beard

a movable piece of armor on a medieval helmet used to protect the lower face

large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges

work hard on something