composer vs Sergei Rachmaninoff

composer and Sergei Rachmaninoff both are nouns.

Word	Noun	Adjective	Verb	Adverb
composer	Yes	No	No	No
Sergei Rachmaninoff	Yes	No	No	No

composer (noun)	Sergei Rachmaninoff (noun)
someone who composes music, usually as a profession	composer and piano virtuoso born in Russia (1873-1943)