Swap

The air quivers around two creatures (no bigger than large) of your choice that you can see within range. An unwilling creature must succeed on a Wisdom saving throw to resist this spell. You teleport each affected target to each others space. 

If one creature succeeds and another fails the save, the creature that fails the save lands in the same space as the creature that succeeds the save, the two creatures are then considered to be in difficult terrain. (unless they have a feature that states otherwise)

Whilst occupying space in this way both creatures must roll All attacks and dexterity saving throws with disadvantage.