Don't know if this is any help, but I had a little guy in my daycare who was diagnosed with hyperlexia - he did not talk at all (he was 3 at the time),but could spell and read three/four letter words. He was fascinated with the alphabet, especially magnetic letters. He did not seem to understand anything but simple commands, and if shown a picture he couldn't tell you what it was. Without the fascination with words and letters, he would have presented as a child with autism, but apparently the early reading made it hyperlexia ??
