Diaghilev vs Sergei Pavlovich Diaghilev

Diaghilev and Sergei Pavlovich Diaghilev both are nouns.

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

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

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

Other synonyms of Diaghilev include Sergei Diaghilev.

Diaghilev (noun)	Sergei Pavlovich 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)