city manager vs civil officer

city manager and civil officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
city manager	Yes	No	No	No
civil officer	Yes	No	No	No

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

Other hypernyms of city manager include politician, civil authority.

city manager (noun)	civil officer (noun)
the head of a city government	a person who exercises authority over civilian affairs