Luminaire is a word used to describe a lighting fixture or lamp. However, there are several other synonyms that can be used to replace this word in different contexts. Some of the common synonyms for luminaire include "lighting device," "fixture," "light source," and "lamp housing." Another term that can be used in place of luminaire is "lantern," which is often used to describe a portable light source. Other synonyms, such as "chandelier," "sconce," and "pendant," are more specific and used to describe different types of lighting fixtures. Regardless of the context, it's important to choose the right synonym to communicate your message effectively.