Are cow ants bigger than any other ant?

Australian Bulldog worker ants and Bullet ants grow to 2.5 cm., which makes them the largest worker ants. But, of course, queen ants are the biggest in each breed of ants, though I don't know how big the Bulldog ant queens are. A queen Driver ant can reach up to 5 cm, and soldier Driver ants can grow to 1.5 cm.