physicist vs John Tyndall

physicist and John Tyndall both are nouns.

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

physicist (noun)	John Tyndall (noun)
a scientist trained in physics	British physicist (born in Ireland) remembered for his experiments on the transparency of gases and the absorption of radiant heat by gases and the transmission of sound through the atmosphere; he was the first person to explain why the daylight sky is blue (1820-1893)