rainmaker vs executive director

rainmaker and executive director both are nouns.

Word	Noun	Adjective	Verb	Adverb
rainmaker	Yes	No	No	No
executive director	Yes	No	No	No

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

rainmaker: executive who is very successful in bringing in business to his company or firm
executive director: a person responsible for the administration of a business

Other hypernyms of rainmaker include executive.

rainmaker (noun)	executive director (noun)
American Indian medicine man who attempt to make it rain	a person responsible for the administration of a business
executive who is very successful in bringing in business to his company or firm