Buchanan vs James Buchanan

Buchanan and James Buchanan both are nouns.

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

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

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

Other synonyms of Buchanan include President Buchanan.

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