psychologist vs G. Stanley Hall

psychologist and G. Stanley Hall both are nouns.

Word	Noun	Adjective	Verb	Adverb
psychologist	Yes	No	No	No
G. Stanley Hall	Yes	No	No	No

psychologist (noun)	G. Stanley Hall (noun)
a scientist trained in psychology	United States child psychologist whose theories of child psychology strongly influenced educational psychology (1844-1924)