Letter on position 1 (f) changed: 13 words bens cens dens gens hens kens lens pens rens sens tens wens yens Letter on position 2 (e) changed: 4 words fans fins fons funs Letter on position 3 (n) changed: 10 words feds fees fegs fehs feis fems fess fets feus feys Letter on position 4 (s) changed: 3 words fend feni fent