Most 2 year olds (geez, he's almost 2!!) are building their vocabulary by repeating everything they hear and see. Elliot's more interested in grouping like objects.
For example, the word apple (ah-ohl) is for any type of fruit.
E: Wan ah-ohl.
A: What? There is no apple. You mean banana? Do you want a banana?
E: Noooooooooooo. Ah-ohl! Peeees?
You can imagine what we hear when we go through the fruit page of his 100 Words book. Ah-ohl, ah-ohl, ah-ohl.
This also is the case for trucks. Any and all trucks from pickups to semi trucks and anything in between - you are now known as firetrucks (fie-twukk), wee-oo wee-oo.
A: Actually, that's a garbage truck.
E: Yep. Fie-twukk! wee-oo wee-oo.
I'm not sure, but I think he's a genius.