Deutsche Mark vs German mark

Deutsche Mark and German mark both are nouns.

Word	Noun	Adjective	Verb	Adverb
Deutsche Mark	Yes	No	No	No
German mark	Yes	No	No	No

As nouns, Deutsche Mark and German mark are synonyms defined as:

Deutsche Mark and German mark: formerly the basic unit of money in Germany

Other synonyms of Deutsche Mark include Deutschmark, mark.

Deutsche Mark (noun)	German mark (noun)
formerly the basic unit of money in Germany	formerly the basic unit of money in Germany