* Noun: This is the most common usage, referring to a short test or assessment.
* Example: "I took a pop quiz in history class."
* Verb: It can also mean to ask questions of someone, often in a playful or challenging way.
* Example: "Let's quiz each other on the capital cities of Europe."
* Adjective: Less common, but it can be used as an adjective to describe something that is short, informal, or unexpected.
* Example: "We had a quiz meeting to discuss the new project."
So, without more context, it's hard to definitively say which part of speech "quiz" is.