chemist vs John Dalton

chemist and John Dalton both are nouns.

Word	Noun	Adjective	Verb	Adverb
chemist	Yes	No	No	No
John Dalton	Yes	No	No	No

chemist (noun)	John Dalton (noun)
a scientist who specializes in chemistry	English chemist and physicist who formulated atomic theory and the law of partial pressures; gave the first description of red-green color blindness (1766-1844)
a health professional trained in the art of preparing and dispensing drugs