German mark vs Deutschmark

German mark and Deutschmark both are nouns.

Word	Noun	Adjective	Verb	Adverb
German mark	Yes	No	No	No
Deutschmark	Yes	No	No	No

As nouns, German mark and Deutschmark are synonyms defined as:

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

Other synonyms of German mark include Deutsche Mark, mark.

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