Here are some examples of words using the prefix "poly":
* Polyglot: A person who knows and can use several languages.
* Polytheism: The belief in multiple gods.
* Polygon: A closed shape with many sides.
* Polysaccharide: A complex carbohydrate made up of many sugar molecules.
* Polyamorous: Having multiple romantic and/or sexual relationships with the consent of all partners.
As you can see, "poly" is used in various fields, including language, religion, mathematics, chemistry, and social studies.