film projector vs projector

film projector and projector both are nouns.

Word	Noun	Adjective	Verb	Adverb
film projector	Yes	No	No	No
projector	Yes	No	No	No

As nouns, projector is a hypernym of film projector; that is, projector is a word with a broader meaning than film projector:

film projector: projects successive frames from a reel of film to create moving pictures
projector: an optical instrument that projects an enlarged image onto a screen

film projector (noun)	projector (noun)
projects successive frames from a reel of film to create moving pictures	an optical instrument that projects an enlarged image onto a screen
	an optical device for projecting a beam of light