MD vs Md.

MD and Md. both are nouns.

Word	Noun	Adjective	Verb	Adverb
MD	Yes	No	No	No
Md.	Yes	No	No	No

As nouns, MD and Md. are synonyms defined as:

MD and Md.: a Mid-Atlantic state; one of the original 13 colonies, with capital Annapolis

Other synonyms of MD include Free State, Maryland, Old Line State.

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