Is the word party a noun?

It can be:

* A noun referring to a social gathering: "We're throwing a party to celebrate her birthday."

* A noun referring to a political group: "He belongs to the Green Party."

* A noun referring to a group of people in a particular place: "The party at the back of the bus was being loud."

Let me know if you'd like examples of how it's used as a noun in different contexts!