Taxims are vertical figure 8s of hips scooping up from the outside and rolling down through the centre.

Mayas are vertical figure 8s coming up the centre and rolling down the outside.

Umis are a very isolated circular movement through the pelvis. It's pelvic tuck forward, hip up on the side, neutral to the back, hip up on the other side, and back to the pelvic tuck. It looks a bit like a hubcap wobbling its way to the ground after spinning.