Here are those words: Yes is 'Awww Way'. This was the very first word that he assigned something to and he has used 'Awww Way' to mean 'Yes' for months now. If you ask Aaron a Yes/No Question he will consistently say 'No' or 'Awww Way'.
Truck is 'Big'. If Aaron says 'Big' he is referring to a truck. If he wants to refer to the size of something as big, he will not say 'Big'. He will say 'Big Bear' or 'Big Bird'. 'Big' alone is a truck.
Grandad is 'Dowel' or 'Dawl'. I am not sure how to spell this one. He has had this one for about a month and he is definitely consistent with it. I think Grandad is just so glad to be called something finally! Jory loves this one. He now refers to his dad as 'Dowel' when he talks about him. It may stick.
Aaron is 'E'. This is fairly new, but he's definitely sticking with it. 'E Bear' is Aaron's Bear.