The Vocabulary of a 4-Year-Old

I've said it before and I'll say it again...at times I think my children are brilliant. Today Doug and I paid special attention to the words Will chose. Breakfast was "delicious", I didn't make it, but the people at Loula's apparently did a great job. While Will was playing with Annemarie this morning he thought the fact that she was holding her rattle on her own was "impressive". And when Doug put Will's sunglasses on he thought that was "hilarious". "Enormous" and "gigantic" are two other favorites and of course "gi-normous" which is not a real word, but one the boys have picked up from the movie Elf. Are our children super-smart? I like to think so. Recently Jack has been having some speech disfluency problems aka stuttering, but when I was talking with his teachers they reminded me he has a large vocabulary and possibly his speech is trying to keep up with his brain. One of Jack's favorite words..."actually" and he usually uses it correctly.