I just rewatched the three brothers episode, and noticed you guys occasionally mix up Gods and Great Beings as you jump back and forth between topics (usually Ekimu and Makuta being called Gods). Although I like the two terms, I have a suggestion to help keep them separate.
Ekimu and Makuta refer to themselves as Great Beings. But the Matoran, who only know them in myths and legends of old, usually just refer to them as Titans.
Ekimu - Titan of Life
Makuta - Titan of Order
Karzahni - Titan of Change (unknown to the Matoran until his revival)
The Titans create the Elemental Gods... similar to how the Olympian Gods were born from Titans in Greek Mythology. Also, it could be a nod to G1 Makuta being called a titan set.
The Elemental Gods could be referred to as just the Gods for short, and could have titles like God of the Tundra, God of the desert, etc. This would connect to the Toa's alternate titles (Toa of the Tundra, etc.)