Two words: Berkshire Hathaway.
Those are, indeed, two words. They'd be more useful if placed into a full sentence, for instance "I think you should put all your net wealth into shares of Berkshire Hathaway" or "I think you should try to replicate Berkshire Hathwaway's investment strategy" or "Hey, you should think about buying a little bit of Berkshire Hathaway as part of a diversified portfolio which also includes other asset classes".
"Berkshire Hathaway is something you can defensibly buy that isn't an index fund."