venture

noun

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

speculation

verb

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

pretendhazardguess
proceed somewhere despite the risk of possible dangers
“We ventured into the world of high-tech and bought a supercomputer”
embark
put at risk

adventure