Near-human are a group of species that are extremely similar, if not identical, to humans. Some use this term to refer to human-esqe lifeforms that don't originate on Earth, though technically humans themselves could be counted as a near-human race.
Atomic Roger seemed to be a near-human, though he appeared human, he seemed to have little actual knowledge of everyday life on Earth. Maximus presumably assumed that Atomic Betty was near-human, as he didn't believe she was from Earth despite her obviously human appearance. (No Space Like Home)