Bill of exchange and Postal order

Bill of exchange noun - A document ordering the payment of money; drawn by one person or bank on another.

Postal order and bill of exchange are semantically related. In some cases you can use "Postal order" instead a noun phrase "Bill of exchange".

Postal order noun - A written order for the payment of a sum to a named individual; obtainable and payable at a post office.

Bill of exchange and postal order are semantically related. You can use "Bill of exchange" instead a noun phrase "Postal order".