TenSoon...was different
As for what else can be cosmere. I had a couple of ideas
The Hush
It might take while to explain but The Hush is a book that takes place in a world where music is dominant. The magic system is called Song and basically allows the user to manipulate their surroundings by playing the "music" found at the heart of what they are trying to manipulate. Anyway, the hypothetical Shard there could be "Synchronisation" or "Melody" or "Harmony". In this world there is a mystical place called the Hush which kinda like a screwed up Spiritual or Cognitive Realm. The place was created by "residual" magic/music and is basically a copy of our "world" but hazy and alot more dangerous. (I am trying not to spoil the book) In the Hush one can create whatever they want using Song. The creation however is only corporeal in the Hush, not in the "real" world. This is useful because, say in the "real" world there is a massive chasm. In the Hush however you can create a bridge then cross it and revert into the "real" world where you will be on the other side of the chasm, seemingly "teleported". There's a problem though. Whenever you use Song in the Hush, you draw creatures called Echoes to you which are dangerous and can kill you, plus they cannot be harmed unless you fins their Song and play it backwards. I am not going to go further and spoil anything else.
Oh and who said the "real" world was really the "real" world? What if the Hush was the "real" world?
The Traitor Son Cycle
The Traitor SOn Cycle is set in a medieval world where there is Civilisation, and the Wild. The Wild is basically nature at it's mightiest and encompasses Wyverns and Dragons and all sorts of creatures. Civilisation is mankind which is trying to keep the WIld at bay lest it overruns the world and destroys humanity. The magic system is extremely complicated, in fact I can barely make sense of it. There are these things called Memory Palaces which hold statues of some sort of Ancient Powers and mighty people from history. You basically invoke their names somehow and cast "spells" like for example
"Herakles! Aristotle! Hippocrates!" and suddenly some giant fist comes out of the sky and kills some dudes.
The Magic you use has like a signature, Green if your using Wild power and Gold if your using Magic. Green is Nature and Gold is (Holy?). Powerful green sorcerers are called Powers of the Wild and Gold sorcerers are called Maguses
Anyway, the Hypothetical Shards here could be "Order", "Chaos" and "Manipulation"