Letter on position 1 (a) changed: 5 words eres ires ores tres ures Letter on position 2 (r) changed: 11 words aces ages akes ales anes apes ates aves awes axes ayes Letter on position 3 (e) changed: 8 words arbs arcs ards arfs aris arks arms arts Letter on position 4 (s) changed: 5 words area ared areg aret arew