DD10 could spell individual words very early, and probably read them, though she only read them aloud right around when she turned 3. In Kindergarten she read chapters books well and was give 5th grade reading comprehension materials by her teacher; by the end of K her reading level appeared to be around grade 8, though it was always a bit hard to tell because lack of background knowledge was an issue. (I remember her Kindergarten teacher giving her a 5th grade passage about the fall of the Berlin Wall, for example--try asking a Kindergartner what they now about the Cold War, lol!) Anyway, I suppose she might fit Hyperlexia III except she had very good comprehension.
She also has dx of ADHD and high functioning autism, but still reads at a very high level. High school? College? I dunno. But she's also great with patterns and working several years ahead in mathematics. The reading was not a transient or isolated skill.
