chemist vs Sir Harold Walter Kroto

chemist and Sir Harold Walter Kroto both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Sir Harold Walter Kroto	Yes	No	No	No

chemist (noun)	Sir Harold Walter Kroto (noun)
a scientist who specializes in chemistry	British chemist who with Robert Curl and Richard Smalley discovered fullerenes and opened a new branch of chemistry (born in 1939)
a health professional trained in the art of preparing and dispensing drugs