McKinley vs President McKinley

McKinley and President McKinley both are nouns.

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

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

McKinley and President McKinley: 25th President of the United States; was assassinated by an anarchist (1843-1901)

Other synonyms of McKinley include William McKinley.

McKinley (noun)	President McKinley (noun)
a mountain in south central Alaska; the highest peak in North America (20,300 feet high)	25th President of the United States; was assassinated by an anarchist (1843-1901)
25th President of the United States; was assassinated by an anarchist (1843-1901)