private function tryWordInColumn($word, $col, $row)
    {
        $wordArray = Utils::stringToArray($word);

        foreach ($wordArray as $letter) {
            if ($this->grid[$row][$col] !== null &&
                $this->grid[$row][$col] !== $letter
            ) {
                return false;
            }
            $row++;
        }

        return true;
    }