Rachmaninoff vs composer

Rachmaninoff and composer both are nouns.

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

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