Letter on position 1 (c) changed: 3 words shacks thacks whacks Letter on position 2 (h) changed: 2 words clacks cracks Letter on position 3 (a) changed: 4 words checks chicks chocks chucks Letter on position 4 (c) changed: 4 words chalks chanks charks chawks Letter on position 5 (k) changed: 2 words chaces chacos