Letter on position 1 (b) changed: 15 words cows dows hows jows kows lows mows nows pows rows sows tows vows wows yows Letter on position 3 (w) changed: 13 words boas bobs bods bogs bohs bois boks boos bops bors boss bots boys Letter on position 4 (s) changed: 2 words bowl bowr