Letter on position 1 (n) changed: 12 words aids bids cids fids gids kids lids mids rids tids vids yids Letter on position 2 (i) changed: 3 words nads neds nods Letter on position 3 (d) changed: 6 words nibs nies nils nims nips nits Letter on position 4 (s) changed: 2 words nide nidi