The term 'Bill Killer' refers to someone who has the power to VETO a bill. The crossword solutions for this term are VETO (4 letters), VETOER (6 letters), and NAY (3 letters). VETO is a noun that means the power to reject or forbid a decision or proposal of a law-making body. Vetoer is a noun that refers to someone who exercises the power of VETO. NAY is an adverb that means no or not in agreement. All three words refer to someone who has the power to reject a bill, making them a 'Bill Killer'.