chemist vs Robert F. Curl

chemist and Robert F. Curl both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Robert F. Curl	Yes	No	No	No

chemist (noun)	Robert F. Curl (noun)
a scientist who specializes in chemistry	American chemist who with Richard Smalley and Harold Kroto discovered fullerenes and opened a new branch of chemistry (born in 1933)
a health professional trained in the art of preparing and dispensing drugs