doctor vs MD

doctor and MD both are nouns.

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

As nouns, doctor and MD are synonyms defined as:

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

doctor (noun)	MD (noun)
children take the roles of physician or patient or nurse and pretend they are at the physician's office	a doctor's degree in medicine
a licensed medical practitioner	a Mid-Atlantic state; one of the original 13 colonies, with capital Annapolis
a person who holds Ph.D. degree (or the equivalent) from an academic institution	a licensed medical practitioner

doctor (verb)	MD (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