Here are some examples:
* Photograph: A picture taken using light.
* Photographic: Relating to the process of taking pictures using light.
* Photosynthesis: The process by which plants use light to convert carbon dioxide and water into food.
* Photoreceptor: A cell that detects light.
* Phototherapy: Treatment using light.
The suffix "-photo" can also be used in more technical terms, often relating to light-sensitive reactions or processes.