venture vs venturous

venture is a noun but venturous is not a noun.

Word	Noun	Adjective	Verb	Adverb
venture	Yes	No	Yes	No
venturous	No	Yes	No	No

venture (noun)	venturous (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

venture (adjective)	venturous (adjective)
	disposed to venture or take risks

venture (verb)	venturous (verb)
put forward, of a guess, in spite of possible refutation
put at risk
proceed somewhere despite the risk of possible dangers