What type of noun is the word harbour?

"Harbour" can be either a common noun or a proper noun, depending on how it's used:

* Common noun: When referring to a general place of shelter for ships, "harbour" is a common noun. For example: "The ship sailed into the harbour."

* Proper noun: When referring to a specific harbor with a name, like "Sydney Harbour," it becomes a proper noun. In this case, it would be capitalized.

Let me know if you have any other word you'd like to know the type of noun for!