James Buchanan vs President Buchanan

James Buchanan and President Buchanan both are nouns.

Word	Noun	Adjective	Verb	Adverb
James Buchanan	Yes	No	No	No
President Buchanan	Yes	No	No	No

As nouns, James Buchanan and President Buchanan are synonyms defined as:

James Buchanan and President Buchanan: 15th President of the United States (1791-1868)

Other synonyms of James Buchanan include Buchanan.

James Buchanan (noun)	President Buchanan (noun)
15th President of the United States (1791-1868)	15th President of the United States (1791-1868)