I’m surprised I didn’t know this: Marvel and DC hold a joint trademark registration on the term “Super Heroes” and variations thereof. The link above includes an interesting discussion on the topic, and this article clarifies the situation somewhat. I do think that the term has become the generic term for costumed heroes, and I am surprised that no one challenged the original registration, since the term was generic by then as well.
Since I am discussing comics, I would just like to throw in an unrelated comics complaint (to DC, anyway, since I’m a longtime DCU fan). Bring back the damned lettercols. Thank you.