Letter on position 1 (r) changed: 10 words bibs dibs fibs gibs jibs libs mibs nibs sibs vibs Letter on position 2 (i) changed: 3 words rebs robs rubs Letter on position 3 (b) changed: 8 words rias rids rifs rigs rims rins rips rits Letter on position 4 (s) changed: 1 word riba