chemist vs Sir Geoffrey Wilkinson

chemist and Sir Geoffrey Wilkinson both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Sir Geoffrey Wilkinson	Yes	No	No	No

chemist (noun)	Sir Geoffrey Wilkinson (noun)
a scientist who specializes in chemistry	English chemist honored for his research on pollutants in car exhausts (born in 1921)
a health professional trained in the art of preparing and dispensing drugs