What is a proper noun for singer?

There isn't a specific proper noun for "singer" in the same way there is for "city" (e.g., "New York City").

Proper nouns are used for specific people, places, or things, like:

* People: Beyoncé, Elvis Presley, Taylor Swift

* Places: London, The Eiffel Tower, Mount Everest

* Things: The Mona Lisa, The Great Wall of China, The Titanic

To make "singer" into a proper noun, you'd need to specify the name of a particular singer, for example:

* "Beyoncé is a singer."

* "The lead singer of the band is named John."

Let me know if you have any other questions!