* Noun: This is the most common usage. It refers to a small piece of paper or card that serves as proof of purchase, admission, or other entitlement.
* Example: "I bought a ticket to the concert."
* Verb: This usage is less common, but it means to mark with a ticket, usually for a traffic violation.
* Example: "The police officer ticketed the driver for speeding."
So, to know for sure which part of speech it is, you need to look at how it's used in a sentence.