physicist vs Joule

physicist and Joule both are nouns.

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

physicist (noun)	Joule (noun)
a scientist trained in physics	English physicist who established the mechanical theory of heat and discovered the first law of thermodynamics (1818-1889)