venture
noun.
any venturesome undertaking especially one with an uncertain outcome
noun.
an investment that is very risky but could yield great profits
he knew the stock was a speculation when he bought it
Synonym: speculation
noun.
a commercial undertaking that risks a loss but promises a profit
verb.
proceed somewhere despite the risk of possible dangers
We ventured into the world of high-tech and bought a supercomputer
Synonym: embark
verb.
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
Synonym: guess, hazard, pretend
verb.
put at risk
I will stake my good reputation for this