Antigua and Barbuda vs St. John's

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

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

Antigua and Barbuda (noun)	St. 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