German mark vs Deutsche Mark

German mark and Deutsche Mark both are nouns.

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

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

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

Other synonyms of German mark include Deutschmark, mark.

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