How use whistle in a sentence as noun?

Here are some examples of "whistle" used as a noun in a sentence:

* "The train engineer blew a long, mournful whistle as it pulled out of the station."

* "The child's toy whistle made a shrill, piercing sound."

* "The referee's whistle signaled the end of the game."

* "The old sailor had a distinctive whistle that he used to call his dog."

* "The carpenter used a whistle to signal his assistant."

Let me know if you'd like more examples!