MD vs Maryland

MD and Maryland both are nouns.

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

As nouns, MD and Maryland are synonyms defined as:

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

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

MD (noun)	Maryland (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	one of the British colonies that formed the United States, with capital Annapolis
a licensed medical practitioner