Francois Couperin vs composer

Francois Couperin and composer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Francois Couperin	Yes	No	No	No
composer	Yes	No	No	No

Francois Couperin (noun)	composer (noun)
French composer of music for organ and a member of a family of distinguished organists (1668-1733)	someone who composes music, usually as a profession