The term 'WORD ON A BILL' can be broken down into three crossword solutions: UNUM (4 letters), DUE (3 letters), and REMIT (5 letters). UNUM is a Latin word meaning 'ONE, ' and is often used in legal documents to refer to a single entity. DUE is an adjective meaning 'OWED' or 'PAYABLE, ' and is commonly used on bills to indicate the amount that must be paid. REMIT is a verb meaning 'to send payment, ' and is often used on bills to indicate the action that must be taken to settle the debt.