CAM, there are 3 key words you can initially use so that you'll have used 15 words of the 26 word alphabet. When I tried it the result was I was lacking one letter to complete my wordle. There is a minuscule chance you will not achieve it in four attempts if an obscure word using the Q or Z are in it. Seeing how they aren't many 5 letter words with Q and Z in them, you'll soon figure the answer.