doctor vs Sir Ronald Ross

doctor and Sir Ronald Ross both are nouns.

Word	Noun	Adjective	Verb	Adverb
doctor	Yes	No	Yes	No
Sir Ronald Ross	Yes	No	No	No

doctor (noun)	Sir Ronald Ross (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	British physician who discovered that mosquitos transmit malaria (1857-1932)
a licensed medical practitioner
a person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	Sir Ronald Ross (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