Cinematograph is a term used to describe a machine that projects moving images onto a screen for entertainment purposes. While it is a well-known term, there are a few synonyms that can be used in its place. One such synonym is "film projector," which is a machine that displays films using a light source, a lens, and a reel. Another synonym is "movie projector," a machine that displays movies in a theater using a light source and a lens. Additionally, "motion picture projector" is a synonym that can be used to describe a machine that displays motion pictures using a projector. All of these synonyms can be used interchangeably with the term cinematograph to describe a machine that projects moving images onto a screen.