Letter on position 1 (f) changed: 16 words ains bins dins gins hins jins kins lins pins rins sins tins vins wins yins zins Letter on position 2 (i) changed: 4 words fans fens fons funs Letter on position 3 (n) changed: 6 words fibs fids figs fils firs fits Letter on position 4 (s) changed: 5 words find fine fini fink fino