A Bill

1. The beak of a bird, especially when small or flattish; sometimes also used with reference to a platypus, turtle, or other animal. Synonyms: beak, neb, nib, pecker
2. A beak-like projection, especially a promontory.
3. Of a cap or hat: the brim or peak, serving as a shade to keep sun off the face and out of the eyes.