player vs Konstantin Sergeevich Alekseev

player and Konstantin Sergeevich Alekseev both are nouns.

Word	Noun	Adjective	Verb	Adverb
player	Yes	No	No	No
Konstantin Sergeevich Alekseev	Yes	No	No	No

player (noun)	Konstantin Sergeevich Alekseev (noun)
a theatrical performer	Russian actor and theater director who trained his actors to emphasize the psychological motivation of their roles (1863-1938)
a person who participates in or is skilled at some game
someone who plays a music as a profession
a person who pursues a number of different social and sexual partners simultaneously
someone who takes part in an activity