Diaghilev vs Sergei Diaghilev

Diaghilev and Sergei Diaghilev both are nouns.

Word	Noun	Adjective	Verb	Adverb
Diaghilev	Yes	No	No	No
Sergei Diaghilev	Yes	No	No	No

As nouns, Diaghilev and Sergei Diaghilev are synonyms defined as:

Diaghilev and Sergei Diaghilev: Russian ballet impresario who founded the Russian ballet and later introduced it to the West (1872-1929)

Other synonyms of Diaghilev include Sergei Pavlovich Diaghilev.

Diaghilev (noun)	Sergei Diaghilev (noun)
Russian ballet impresario who founded the Russian ballet and later introduced it to the West (1872-1929)	Russian ballet impresario who founded the Russian ballet and later introduced it to the West (1872-1929)