composer vs Couperin

composer and Couperin both are nouns.

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

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