Letter on position 1 (c) changed: 5 words foster goster poster roster zoster Letter on position 2 (o) changed: 1 word caster Letter on position 3 (s) changed: 6 words coater colter cooter copter cotter couter Letter on position 4 (t) changed: 2 words cosher cosier Letter on position 5 (e) changed: 1 word costar Letter on position 6 (r) changed: 2 words costed costes