All the ones you guys said, especially every single second of the tent scene and every single second of the reunion kiss, not counting the Alma parts (I forgot to breathe, too, monimm!), plus:
In the first tent scene, right after they jolt out of bed, when Ennis slowly leans forward, then pushes Jack away, then reaches out and grabs Jack and pulls him closer and strokes his hair ...! Oh, and then when they're holding hands ... I'm forgetting to breathe right now.
When Mrs. Twist puts her hand on Ennis' shoulder, offering the only moment of comfort he will ever get.
When Ennis shoots the elk and Jack pushes him and then Ennis pushes Jack back. Oops, I guess that's not wordless. But what they're communicating is!
When Ennis rubs his blood on his and Jack's shirts. When he collapses in the alley. When he reads Jack's first postcard and his face lights up. When ...
Oh, I could just go on and on.