This is because "port" has multiple meanings, and depending on the context, can refer to:
* A harbor or a place where ships can dock: *The ship was docked at the port.*
* A type of fortified wine: *I'd like a glass of port with my cheese.*
* The left side of something: *The captain stood on the port side of the ship.*
* To carry or transport: *The truck will port the goods to the warehouse.*
It's important to understand the context in which the word "port" is used to determine its specific meaning.