pairaduex
Two words that can be combined in any order to make two new compound words. It’s the original flex, and also the reason why your brain feels like it's on fire sometimes.
Fish and fry. Fry fish. One is a meal. The other sounds like something you eat while crying.
Pencil and eraser. Eraser pencil. Both are real. But one of them is just plain ridiculous.
Burger and shake. Shake burger. One is food. The other feels like it was invented by someone who hates both.