Isn't one of the main parts of a dictionary the bit that explains how to pronounce the words it lists?
The thing I always found interesting about a dictionary is that because it uses words to describe other words it's only useful if you know at least some words. If you didn't know any words at all, it wouldn't help you. So it doesn't really add knowledge so much as it multiplies it.
I think if you want to get the "No Words" crowd you are going to need a video display.