Is there an instrument that combines the safety of bonds with at least some possibility of upside?

It's quite difficult to know if we are in a bubble or simply a period of large growth. I've seen p/e above a thousand on NASDAQ. That kind of screams "bubble". However, it's undeniable that there is large growth as well. Is there any instrument that combines the safety of bonds with at least some possibility of upside, so that if the growth turns out to be real then there is a benefit?

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