Letter on position 1 (c) changed: 3 words shack thack whack Letter on position 2 (h) changed: 2 words clack crack Letter on position 3 (a) changed: 4 words check chick chock chuck Letter on position 4 (c) changed: 4 words chalk chank chark chawk Letter on position 5 (k) changed: 2 words chace chaco