doctor vs Walter Gilbert

doctor and Walter Gilbert both are nouns.

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

doctor (noun)	Walter 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 person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	Walter 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