Letter on position 1 (r) changed: 12 words aids bids cids fids gids kids lids mids nids tids vids yids Letter on position 2 (i) changed: 4 words rads reds rods ruds Letter on position 3 (d) changed: 8 words rias ribs rifs rigs rims rins rips rits Letter on position 4 (s) changed: 1 word ride