...that he uses regularly. He said "duck" a long time ago, but only a few times and then never again. Blaise says "ma-ma," and "da-da," some animal sounds, a couple of his own made up words and some random words only once. BUT, "ball" is really the first word he has continually (and correctly) used.
(it is kind of hard to take videos of him, since he wants to see the pictures on the other side of the camera and constantly is pulling at it, but you get the idea :) )