venture

any venturesome undertaking especially one with an uncertain outcome

a commercial undertaking that risks a loss but promises a profit

an investment that is very risky but could yield great profits

he knew the stock was a speculation when he bought it

put forward, of a guess, in spite of possible refutation

I am guessing that the price of real estate will rise again

I cannot pretend to say that you are wrong

proceed somewhere despite the risk of possible dangers

We ventured into the world of high-tech and bought a supercomputer

put at risk

I will stake my good reputation for this