physicist vs William Gilbert

physicist and William Gilbert both are nouns.

Word	Noun	Adjective	Verb	Adverb
physicist	Yes	No	No	No
William Gilbert	Yes	No	No	No

physicist (noun)	William Gilbert (noun)
a scientist trained in physics	English court physician noted for his studies of terrestrial magnetism (1540-1603)
	a librettist who was a collaborator with Sir Arthur Sullivan in a famous series of comic operettas (1836-1911)