Queen City vs Charlotte

Queen City and Charlotte both are nouns.

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

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

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

Queen City (noun)	Charlotte (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