doctor vs Sir James Young Simpson

doctor and Sir James Young Simpson both are nouns.

Word	Noun	Adjective	Verb	Adverb
doctor	Yes	No	Yes	No
Sir James Young Simpson	Yes	No	No	No

doctor (noun)	Sir James Young Simpson (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	Scottish obstetrician and surgeon who pioneered in the use of ether and discovered the anesthetic effects of chloroform (1811-1870)
a licensed medical practitioner
a person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	Sir James Young Simpson (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