Giftedness

Taken from Wikipedia:

Generally, gifted individuals learn more quickly, deeply, and broadly
than their peers. Gifted children may learn to read early and operate
at the same level as normal children who are significantly older. The
gifted tend to demonstrate high reasoning ability, creativity,
curiosity, a large vocabulary,
and an excellent memory. They often can master concepts with few
repetitions. They may also be physically and emotionally sensitive, perfectionistic, and may frequently question authority.
Some have trouble relating to or communicating with their peers because
of disparities in vocabulary size (especially in the early years),
personality, and interests. As children, they may prefer the company of
older children or adults.