Monroe vs President Monroe

Monroe and President Monroe both are nouns.

Word	Noun	Adjective	Verb	Adverb
Monroe	Yes	No	No	No
President Monroe	Yes	No	No	No

As nouns, Monroe and President Monroe are synonyms defined as:

Monroe and President Monroe: 5th President of the United States; author of the Monroe Doctrine (1758-1831)

Other synonyms of Monroe include James Monroe.

Monroe (noun)	President Monroe (noun)
a town in north central Louisiana	5th President of the United States; author of the Monroe Doctrine (1758-1831)
a town of southeast Michigan on Lake Erie
5th President of the United States; author of the Monroe Doctrine (1758-1831)
United States film actress noted for sex appeal (1926-1962)