pairaduex
Two words that can be combined in either order to make two new compound words. It’s like getting double the fun, and also double the trouble.
Dog and bone. Bone dog. One is a classic. The other sounds like something that barks at you when you're trying to sleep.
Tree and house. House tree. Both are real. But one of them is just confusing.
Book and bag. Bag book. One you carry around. The other feels like it was written by someone who hates backpacks.