I really like a simple risk matrix as a visual aid, because it makes it much easier for me to explain of how severity and probability combine to make a risk more or less serious than if I tried to explain it with words alone.
Words and pictures are intricately linked in journalism, advertising and educational contexts. Words printed under a photograph, the caption, signal the importance of the common sense representations portrayed in the image. Words beside a picture in an advertisement explain a product and its attributes clearly to a potential customer. Words spoken by an instructor give explanations and life to slides projected from the back of a darkened classroom. Words and images work together for most successful communications.
Here are some great product links and quotes on rapid UI prototyping that have helped reinforce the value of visualized requirements in my mind, and that I thought you might find interesting.