I'm familiar with hearing about 3 types of hyperlexia. Based on that, I would suggest reading up on hyperlexia and then asking the school for more information on their mention of hyperlexia, what they mean by hyperlexia in this context (in reference to your child), the type of hyperlexia they believe they are seeing, and what causes them to believe they are seeing hyperlexia.

You want the information flowing TO you, not FROM you in this conversation. This would not be a time to share what you've learned by reading up on it, what you see and/or do not see in your child, etc. There would be time for that later. This is a time to listen and gather what the school has observed.

The school may describe to you exactly what you have also noticed: a child out-reading their vocabulary. The school may also describe if they believe they may be observing autism-like characteristics, traits, behaviors, and/or development patterns for a child who may be high functioning and "on the spectrum."

Here is a brief roundup of links comparing gifted and ASD:
- old post (2016) with link to article comparing gifted characteristics and ASD characteristics
- post (2017) with checklist comparing gifted and ASD traits (hat tip to BananaGirl)
- post (2017) with link to Gifted Resource Center of New England (GRCNE) article comparing gifted and ASD traits (hat tip to Nolepharm).