Letter on position 1 (p) changed: 16 words ains bins dins fins gins hins jins kins lins rins sins tins vins wins yins zins Letter on position 2 (i) changed: 4 words pans pens pons puns Letter on position 3 (n) changed: 8 words pias pics pies pigs pips pirs piss pits Letter on position 4 (s) changed: 6 words pina pine ping pink pint piny