【Money】 ,  【cash】 ,  【currency】 ,  【legal tender】 ,  【specie】 ,  【coin】 ,  【coinage】  are comparable when they mean pieces of stamped metal or their equivalents issued by a government, or by an authority recognized by the government, to serve as a medium of exchange in the country or section under the control of that government.

【Money】  applies to both coined gold, silver, copper, or other metal issued as a medium of exchange and to certificates or notes, often called specifically paper 【money】 , that sometimes promise payment in metal 【money】 , are issued by a government or governmentally recognized authority (as a bank), and pass like coined metal as a medium of exchange.

【Cash】  applies to 【money】 , sometimes specifically called ready 【money】 , actually in hand or immediate possession of an individual or a business or institution.

【Currency】 may apply to all of the 【money】 in circulation, as distinguished from that which is not in circulation for one reason or another, but it may also apply to paper 【money】 as distinguished from coined metal.

【Legal tender】  applies specifically to the type of 【money】 which the law authorizes a debtor to offer and requires a creditor to receive as payment of 【money】 obligations and may or may not at any given time include all lawful 【money】 of a particular jurisdiction.

【Specie】 ,  【coin】  (only in a collective sense), and  【coinage】 apply only to minted or coined 【money】 ; they therefore imply an opposition to all forms of paper 【money】 (as treasury notes and bank notes).