General synonyms:
* Bill: This is the most common synonym for "beak".
* Rostrum: This term is more scientific and often used for the beak of birds of prey or other animals with a prominent beak.
* Snout: This term is often used for the beak of birds that are not typically considered birds of prey, such as chickens or ducks.
More specific synonyms:
* Culmen: The upper ridge of the beak.
* Tomium: The cutting edge of the beak.
* Rhamphotheca: The horny covering of the beak.
The best synonym to use will depend on the specific situation and the bird in question.