physicist vs Kelvin

physicist and Kelvin both are nouns.

Word	Noun	Adjective	Verb	Adverb
physicist	Yes	No	No	No
Kelvin	Yes	No	No	No

physicist (noun)	Kelvin (noun)
a scientist trained in physics	British physicist who invented the Kelvin scale of temperature and pioneered undersea telegraphy (1824-1907)