doctor vs David Bruce

doctor and David Bruce both are nouns.

Word	Noun	Adjective	Verb	Adverb
doctor	Yes	No	Yes	No
David Bruce	Yes	No	No	No

doctor (noun)	David Bruce (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	Australian physician and bacteriologist who described the bacterium that causes undulant fever or brucellosis (1855-1931)
a licensed medical practitioner
a person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	David Bruce (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