Each of these nine pictures represents a four-letter word. If you place those words in the right sequence, they will form a word chain in which one letter changes to make each new word. What is that word chain?

We started with one of the green pictures and ended with one of the brown pictures, but the chain works just as well if you go in the opposite direction. If you are having difficulty coming up with 4-letter words for each picture, know that the picture on the top row center is a leak. The picture at the left side of the second row is a boar.