What is a proper noun for boat?

There isn't a single, universal proper noun for a boat. A proper noun is a specific name for a person, place, or thing.

To give a boat a proper noun, you would need to choose a name for it. Some examples of proper nouns for boats could be:

* The Seafarer

* The Black Pearl

* The Mayflower

* The Titanic

* The S.S. Minnow

These are all specific names given to individual boats, making them proper nouns.