director vs decision maker

director and decision maker both are nouns.

Word	Noun	Adjective	Verb	Adverb
director	Yes	No	No	No
decision maker	Yes	No	No	No

As nouns, decision maker is a hypernym of director; that is, decision maker is a word with a broader meaning than director:

Other hypernyms of director include administrator.

director (noun)	decision maker (noun)
someone who controls resources and expenditures	someone who administers a business
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