legal tender vs monetary system

legal tender and monetary system both are nouns.

Word	Noun	Adjective	Verb	Adverb
legal tender	Yes	No	No	No
monetary system	Yes	No	No	No

As nouns, monetary system is a hypernym of legal tender; that is, monetary system is a word with a broader meaning than legal tender:

legal tender: something that can be used as an official medium of payment
monetary system: anything that is generally accepted as a standard of value and a measure of wealth in a particular country or region

Other hypernyms of legal tender include medium of exchange.

legal tender (noun)	monetary system (noun)
something that can be used as an official medium of payment	anything that is generally accepted as a standard of value and a measure of wealth in a particular country or region