doctor vs physician

doctor and physician both are nouns.

Word	Noun	Adjective	Verb	Adverb
doctor	Yes	No	Yes	No
physician	Yes	No	No	No

As nouns, doctor and physician are synonyms defined as:

Other synonyms of doctor include doc, Dr., MD, medico.

doctor (noun)	physician (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	a licensed medical practitioner
a licensed medical practitioner
a person who holds Ph.D. degree (or the equivalent) from an academic institution

doctor (verb)	physician (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