physicist vs John Dalton

physicist and John Dalton both are nouns.

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

physicist (noun)	John Dalton (noun)
a scientist trained in physics	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)