chemist vs Tadeus Reichstein

chemist and Tadeus Reichstein both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
Tadeus Reichstein	Yes	No	No	No

chemist (noun)	Tadeus Reichstein (noun)
a scientist who specializes in chemistry	a Swiss chemist born in Poland; studied the hormones of the adrenal cortex
a health professional trained in the art of preparing and dispensing drugs