Letter on position 1 (c) changed: 4 words brass frass grass trass Letter on position 2 (r) changed: 1 word class Letter on position 3 (a) changed: 2 words cress cross Letter on position 4 (s) changed: 7 words crabs crags crams crans craps craws crays Letter on position 5 (s) changed: 1 word crash