Word Wizard for calculating words count with business logic flaw

wordWizard.js

const stopWords = ["a", "about", "above", "after", "again", "against", "all", "am", "an", "and", "any", "are", "as", "at", "be", "because", "been", "before", "being", "below", "between", "both", "but", "by", "could", "did", "do", "does", "doing", "down", "during", "each", "few", "for", "from", "further", "had", "has", "have", "having", "he", "he'd", "he'll", "he's", "her", "here", "here's", "hers", "herself", "him", "himself", "his", "how", "how's", "i", "i'd", "i'll", "i'm", "i've", "if", "in", "into", "is", "it", "it's", "its", "itself", "let's", "me", "more", "most", "my", "myself", "nor", "of", "on", "once", "only", "or", "other", "ought", "our", "ours", "ourselves", "out", "over", "own", "same", "she", "she'd", "she'll", "she's", "should", "so", "some", "such", "than", "that", "that's", "the", "their", "theirs", "them", "themselves", "then", "there", "there's", "these", "they", "they'd", "they'll", "they're", "they've", "this", "those", "through", "to", "too", "under", "until", "up", "very", "was", "we", "we'd", "we'll", "we're", "we've", "were", "what", "what's", "when", "when's", "where", "where's", "which", "while", "who", "who's", "whom", "why", "why's", "with", "would", "you", "you'd", "you'll", "you're", "you've", "your", "yours", "yourself", "yourselves"];

exports.getWordsCountInDesc = function (sentence, callBack) {
    let words = getWordsFromSentence(sentence);
    let wordsWithCount = getWordsWithCount(words);
    let wordsWithCountInDesc = getWordsWithCountInDescendingOrder(wordsWithCount);
    callBack(null, wordsWithCountInDesc);
}

//Sort words in descending order based on counts
var getWordsWithCountInDescendingOrder = function (wordsWithCount) {
    return Object.keys(wordsWithCount)
        .sort((word, anotherWord) => wordsWithCount[anotherWord] - wordsWithCount[word])
        .reduce((wordsWithCountInDesc, word) => {
            wordsWithCountInDesc[word] = wordsWithCount[word];
            return wordsWithCountInDesc;
        }, {});
}

// Gives words array after convering to lower case replacing characters like comma, full stop & etc
var getWordsFromSentence = function (sentence) {
    sentence = sentence.toLowerCase();
    sentence = sentence.replace('/./g', ' ');
    sentence = sentence.replace('/,/g', ' ');
    sentence = sentence.replace('/  /g', ' ');
    sentence = sentence.trim();
    let words = sentence.split(' ');

    return words;
}

// Returns words with count after removing stop words
var getWordsWithCount = function (words) {
    let wordsWithCount = {};
    words.forEach(word => {
        if (!isItStopWord(word)) {
            if (wordsWithCount[word]) {
                wordsWithCount[word] += 1;
            } else {
                wordsWithCount[word] = 1;
            }
        }
    });

    return wordsWithCount;
}

//Returns wether word is a stop word or not
var isItStopWord = function (word) {
    return stopWords.includes(word);
}