Letter on position 1 (b) changed: 3 words calks talks walks Letter on position 2 (a) changed: 2 words bilks bulks Letter on position 3 (l) changed: 5 words backs banks barks basks bauks Letter on position 4 (k) changed: 6 words balas balds bales balls balms balus Letter on position 5 (s) changed: 1 word balky