public function longestWord()
    {
        $words = str_word_count($this->returnValue, 1);

        $longestWordLength = 0;
        $longestWord       = "";

        foreach ($words as $word) {
            if (strlen($word) > $longestWordLength) {
                $longestWordLength = strlen($word);
                $longestWord       = $word;
            }
        }

        return self::create($longestWord);
    }