arraySortByCustomAlphabet.js

var dictionary = ['miel', 'extraterrestre', 'al', 'automovil', 'auto', 'revestir'];
var alphabet = "zyxwvutsrqponmlkjihgfedcba";

function sort(dictionary, alphabet) {

    function translate(str, alphabet) {
        var abc = "abcdefghijklmnopqrstuvwxyz";
        return [].map.call(str, function(c) {
            return alphabet[abc.indexOf(c)] || c;
        }).join(" ");
    }
    return (dictionary.sort(function(a, b) {
        return translate(a, alphabet).localeCompare(translate(b, alphabet));
    }));
}