district manager vs manager

district manager and manager both are nouns.

Word	Noun	Adjective	Verb	Adverb
district manager	Yes	No	No	No
manager	Yes	No	No	No

As nouns, manager is a hypernym of district manager; that is, manager is a word with a broader meaning than district manager:

district manager: a manager who supervises the sales activity for a district
manager: someone who controls resources and expenditures

Other hypernyms of district manager include director, managing director.

district manager (noun)	manager (noun)
a manager who supervises the sales activity for a district	someone who controls resources and expenditures
	(sports) someone in charge of training an athlete or a team