Letter on position 1 (s) changed: 9 words bums fums gums hums lums mums rums tums vums Letter on position 2 (u) changed: 3 words sams sims soms Letter on position 3 (m) changed: 8 words subs suds sues suks suns sups suqs suss Letter on position 4 (s) changed: 3 words sumo sump sumy