Negotiable instrument

"Order" - Written instrument that allows the holder to be paid money or to do something

For ex: A banker's Postal order i.e., an order to bank / Post office to pay money

Bearer: Person who has a cheque for payment on demand

For ex; This cheque is payable to the bearer i.e, to the person who presents it at a bank.

Now i hope you understood the meaning of the words Order & Bearer.