chemist vs Manfred Eigen

chemist and Manfred Eigen both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Manfred Eigen	Yes	No	No	No

chemist (noun)	Manfred Eigen (noun)
a scientist who specializes in chemistry	German chemist who did research on high-speed chemical reactions (born in 1927)
a health professional trained in the art of preparing and dispensing drugs