Letter on position 1 (r) changed: 10 words buns duns funs guns huns muns nuns puns suns tuns Letter on position 2 (u) changed: 2 words rens rins Letter on position 3 (n) changed: 7 words rubs rucs ruds rues rugs rums ruts Letter on position 4 (s) changed: 4 words rund rune rung runt