Letter on position 1 (t) changed: 10 words beds feds geds keds meds neds peds reds weds zeds Letter on position 2 (e) changed: 3 words tads tids tods Letter on position 3 (d) changed: 10 words teas tecs tees tefs tegs tels tems tens tets tews Letter on position 4 (s) changed: 1 word tedy