medical practitioner vs MD

medical practitioner and MD both are nouns.

Word	Noun	Adjective	Verb	Adverb
medical practitioner	Yes	No	No	No
MD	Yes	No	No	No

As nouns, MD is a hyponym of medical practitioner; that is, MD is a word with a more specific, narrower meaning than medical practitioner:

medical practitioner (noun)	MD (noun)
someone who practices medicine	a doctor's degree in medicine
	a Mid-Atlantic state; one of the original 13 colonies, with capital Annapolis
	a licensed medical practitioner