Charlotte vs Queen City

Charlotte and Queen City both are nouns.

Word	Noun	Adjective	Verb	Adverb
Charlotte	Yes	No	No	No
Queen City	Yes	No	No	No

As nouns, Charlotte and Queen City are synonyms defined as:

Charlotte and Queen City: the largest city in North Carolina; located in south central North Carolina

Charlotte (noun)	Queen City (noun)
the largest city in North Carolina; located in south central North Carolina	the largest city in North Carolina; located in south central North Carolina