legal tender

English Thesaurus

1. something that can be used as an official medium of payment (noun.possession)

hypernym	:	medium of exchange, monetary system,
definition	:	anything that is generally accepted as a standard of value and a measure of wealth in a particular country or region (noun.possession)

hyponym	:	food stamp,
definition	:	a government-issued stamp that can be used in exchange for food (noun.possession)