Ellington vs Duke Ellington

Ellington and Duke Ellington both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ellington	Yes	No	No	No
Duke Ellington	Yes	No	No	No

As nouns, Ellington and Duke Ellington are synonyms defined as:

Ellington and Duke Ellington: United States jazz composer and piano player and bandleader (1899-1974)

Other synonyms of Ellington include Edward Kennedy Ellington.

Ellington (noun)	Duke Ellington (noun)
United States jazz composer and piano player and bandleader (1899-1974)	United States jazz composer and piano player and bandleader (1899-1974)