doctor vs William Gilbert

doctor and William Gilbert both are nouns.

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

doctor (noun)	William Gilbert (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	English court physician noted for his studies of terrestrial magnetism (1540-1603)
a licensed medical practitioner	a librettist who was a collaborator with Sir Arthur Sullivan in a famous series of comic operettas (1836-1911)
a person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	William Gilbert (verb)
give medical treatment to
alter and make impure, as with the intention to deceive
restore by replacing a part or putting together what is torn or broken