Letter on position 1 (s) changed: 10 words bibs dibs fibs gibs jibs libs mibs nibs ribs vibs Letter on position 2 (i) changed: 3 words sabs sobs subs Letter on position 3 (b) changed: 8 words sics sies sims sins sips sirs siss sits Letter on position 4 (s) changed: 1 word sibb