capital of Antigua and Barbuda vs Saint John's

capital of Antigua and Barbuda and Saint John's both are nouns.

Word	Noun	Adjective	Verb	Adverb
capital of Antigua and Barbuda	Yes	No	No	No
Saint John's	Yes	No	No	No

As nouns, capital of Antigua and Barbuda and Saint John's are synonyms defined as:

capital of Antigua and Barbuda and Saint John's: the capital and largest city of Antigua and Barbuda; located on the island of Antigua

Other synonyms of capital of Antigua and Barbuda include St. John's.

capital of Antigua and Barbuda (noun)	Saint John's (noun)
the capital and largest city of Antigua and Barbuda; located on the island of Antigua	a port and provincial capital of Newfoundland
	the capital and largest city of Antigua and Barbuda; located on the island of Antigua