Letter on position 1 (s) changed: 3 words chacks thacks whacks Letter on position 2 (h) changed: 4 words slacks smacks snacks stacks Letter on position 3 (a) changed: 2 words shocks shucks Letter on position 4 (c) changed: 2 words shanks sharks Letter on position 6 (s) changed: 1 word shacko