Letter on position 1 (p) changed: 6 words bass jass lass mass sass tass Letter on position 2 (a) changed: 3 words piss poss puss Letter on position 3 (s) changed: 13 words pacs pads pahs pais pals pams pans paps pars pats pavs paws pays Letter on position 4 (s) changed: 3 words pase pash past