My boy has two words. One of them is "HI". He usually greets the pets with more enthusiasm than he greets humans. Today he came into the kitchen with me and got down on his hands and knees and spoke to what appeared to me to be the bottom of the dishwasher. "Hi!" he said with all the enthusiasm he could muster. I glanced down and didn't see anything and thought to myself the kid was going bonkers. A few minutes later I was back in the kitchen, this time alone, and who should come out to visit me from under the counter but a little mouse!
My boy may not be able to speak, but he's no dummy.