doctor vs practice of medicine

doctor and practice of medicine both are nouns.

Word	Noun	Adjective	Verb	Adverb
doctor	Yes	No	Yes	No
practice of medicine	Yes	No	No	No

doctor (noun)	practice of medicine (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	the learned profession that is mastered by graduate training in a medical school and that is devoted to preventing or alleviating or curing diseases and injuries
a licensed medical practitioner
a person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	practice of medicine (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