What makes it different from something like Alphas or Fringe is that they're not afraid to use the word "superhero."
Marvel and DC actually co-own the copyrights to the word "superhero".
No, they share a trademark, not a copyright. A copyright protects a literary or artistic work, while a trademark is a registered word, phrase, or symbol serving as an identifier for a distinct brand or product. What the trademark means is that nobody but Marvel and DC can use the phrase "super hero" or variations thereon in the title
of a publication or product, or otherwise in a marketing context such as in an advertising slogan. But you can use it in the body of a work, as I was able to do in my novel Only Superhuman
Here's a FAQ about it
, and here's an article with more