Letter on position 1 (b) changed: 11 words coys doys foys goys hoys joys loys moys noys soys toys Letter on position 2 (o) changed: 3 words bays beys buys Letter on position 3 (y) changed: 13 words boas bobs bods bogs bohs bois boks boos bops bors boss bots bows Letter on position 4 (s) changed: 3 words boyf boyg boyo