optical device - a device for producing or controlling light

epidiascope - a projector for images for both transparent and opaque objects

front projector - a projector for digital input

cine projector, film projector, movie projector - projects successive frames from a reel of film to create moving pictures

optical instrument - an instrument designed to aid vision

overhead projector - a projector operated by a speaker; projects the image over the speaker's head

slide projector - projector that projects an enlarged image of a slide onto a screen