The prefix "photo-" is derived from the Greek word for "light" and is commonly used to signify an association with photography or light. There are several synonyms to this prefix that can be used in everyday language or specialized contexts. Some common synonyms for "photo-" include "opto-" which is often used in the context of optics or vision, "lumino-" which can be used to refer to light or lighting equipment, and "radi-" which is often used in the context of radiation or electromagnetic energy. Additionally, "chroma-" can be used to refer to color, which is an essential part of photography. Overall, these synonyms for "photo-" provide a range of associations that can add specificity and depth to one's language use.