director vs film director

director and film director both are nouns.

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

As nouns, director and film director are synonyms defined as:

director (noun)	film director (noun)
someone who controls resources and expenditures	the person who directs the making of a film
the person who leads a musical group
someone who supervises the actors and directs the action in the production of a show
member of a board of directors
the person who directs the making of a film