manager vs managing director

manager and managing director both are nouns.

Word	Noun	Adjective	Verb	Adverb
manager	Yes	No	No	No
managing director	Yes	No	No	No

As nouns, manager and managing director are synonyms defined as:

manager and managing director: someone who controls resources and expenditures

Other synonyms of manager include director.

manager (noun)	managing director (noun)
someone who controls resources and expenditures	someone who controls resources and expenditures
(sports) someone in charge of training an athlete or a team