(1):

(n.) A head official; as, the warden of a college; specifically (Eccl.), a churchwarden.

(2):

(n.) A large, hard pear, chiefly used for baking and roasting.

(3):

(n.) A keeper; a guardian; a watchman.

(4):

(n.) An officer who keeps or guards; a keeper; as, the warden of a prison.