Antigua and Barbuda vs Saint John's

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

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

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