Annapolis vs capital of Maryland

Annapolis and capital of Maryland both are nouns.

Word	Noun	Adjective	Verb	Adverb
Annapolis	Yes	No	No	No
capital of Maryland	Yes	No	No	No

As nouns, Annapolis and capital of Maryland are synonyms defined as:

Annapolis and capital of Maryland: state capital of Maryland; site of the United States Naval Academy

Annapolis (noun)	capital of Maryland (noun)
state capital of Maryland; site of the United States Naval Academy	state capital of Maryland; site of the United States Naval Academy