chemist vs Wilhelm Ostwald

chemist and Wilhelm Ostwald both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Wilhelm Ostwald	Yes	No	No	No

chemist (noun)	Wilhelm Ostwald (noun)
a scientist who specializes in chemistry	German chemist (1853-1932)
a health professional trained in the art of preparing and dispensing drugs