For non-professionals, the general situation is:

Futures have the highest risk, followed by stocks, and corporate bonds have the smallest risk.

But it depends on which company’s bonds you buy. The corporate bonds of some high-quality companies are safer and have a relatively certain rate of return. But buying a company that is poorly managed, heavily in debt, insolvent and about to go bankrupt is better. The bonds may face the possibility of losing all their money. Because the company has too much debt, it may not be able to get much money in the event of bankruptcy and liquidation. The final loss may be greater than futures and stocks.