I used to see it this in the old “Games” magazines. It was a word puzzle and for example it would have the word “Chair” like high up in the top of a box, and the solution was the word “High Chair”.
I know the puzzle has a name but cannot find it for the life of me. And searching for word puzzles and high chairs just isn’t coming back with what I need.
My son’s elementary school has a few of these hung on the cafeteria wall. One of them has been there a long time, and I’ve never been able to figure it out. I need to go look at it again and post here to crowd-source the answer.