Letter on position 1 (s) changed: 10 words bubs cubs dubs fubs gubs hubs nubs pubs rubs tubs Letter on position 2 (u) changed: 3 words sabs sibs sobs Letter on position 3 (b) changed: 8 words suds sues suks sums suns sups suqs suss Letter on position 4 (s) changed: 1 word suba