physicist vs Cecil Frank Powell

physicist and Cecil Frank Powell both are nouns.

Word	Noun	Adjective	Verb	Adverb
physicist	Yes	No	No	No
Cecil Frank Powell	Yes	No	No	No

physicist (noun)	Cecil Frank Powell (noun)
a scientist trained in physics	English physicist who discovered the pion (the first known meson) which is a subatomic particle involved in holding the nucleus together (1903-1969)