Melvil Dewey vs Dewey

Melvil Dewey and Dewey both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melvil Dewey	Yes	No	No	No
Dewey	Yes	No	No	No

As nouns, Melvil Dewey and Dewey are synonyms defined as:

Melvil Dewey and Dewey: United States librarian who founded the decimal system of classification (1851-1931)

Other synonyms of Melvil Dewey include Melville Louis Kossuth Dewey.

Melvil Dewey (noun)	Dewey (noun)
United States librarian who founded the decimal system of classification (1851-1931)	United States pragmatic philosopher who advocated progressive education (1859-1952)
	a United States naval officer remembered for his victory at Manila Bay in the Spanish-American War
	United States librarian who founded the decimal system of classification (1851-1931)