chemist vs Robert Wilhelm Bunsen

chemist and Robert Wilhelm Bunsen both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Robert Wilhelm Bunsen	Yes	No	No	No

chemist (noun)	Robert Wilhelm Bunsen (noun)
a scientist who specializes in chemistry	German chemist who with Kirchhoff pioneered spectrum analysis but is remembered mainly for his invention of the Bunsen burner (1811-1899)
a health professional trained in the art of preparing and dispensing drugs