The Worldly Gods are the gods who the most interactions will occur with. In our own world, I would most likely portray the likes of the Greek Pantheon, the Norse Æsir, etc as different families of Worldly Gods.
These gods will most likely be the most prominent figures who are worshipped by religions, since they, at one point at least, likely interacted a fair amount with mortals, since most of them actually live on a particular planet. This would allow for mortals to then whiteness their power, learn their teachings, etc.
The exact abilities of the different Worldly Gods will likely vary quite drastically, however one thing that will be consistent, is that their abilities can be well understood. That being said, not everyone actually in the world will understand them, but they are actually comprehensible, which is not really the case for The Young Gods, or really anyone else above them.
Additionally, The Worldly Gods in a given universe will have most likely been created by either The Young Gods, or The Old Gods, and will therefore, even in there most core elements vary from universe to universe. So while they are all linked in concept, there is nothing actually tying together Worldly Gods from two different places. I will likely have individual Species articles for each of the different groups of Worldly Gods to describe their specific traits, abilities, etc. Then I will use the Characters module to describe individual gods.