Main Difference
The main difference between Venture and Startup is that the Venture is a a business enterprise, typically one that involves risk and a startup is a company working to solve a problem where the solution is not obvious and success is not guaranteed.
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Venture (noun) A risky or daring undertaking or journey. 
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Venture (noun) An event that is not, or cannot be, foreseen; an accident; chance; contingency. 
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Venture (noun) The thing risked; a stake; especially, something sent to sea in trade. 
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Venture (verb) To undertake a risky or daring journey. 
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Venture (verb) To risk or offer. “to venture funds” “to venture a guess” “Nothing venture, nothing win” 
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Venture (verb) to dare to engage in; to attempt without any certainty of success. Used with at or on 
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Venture (verb) To put or send on a venture or chance. “to venture a horse to the West Indies” 
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Venture (verb) To confide in; to rely on; to trust. 
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Venture (verb) To say something. 
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Venture (noun) a risky or daring journey or undertaking “pioneering ventures into little-known waters” 
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Venture (noun) a business enterprise, typically one that involves risk “a joint venture between two aircraft manufacturers” 
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Venture (verb) undertake a risky or daring journey or course of action “she ventured out into the blizzard” 
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Venture (verb) expose to the risk of loss “agents for other people’s money, they do not venture their own capital” 
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Venture (verb) dare to do or say something that may be considered audacious (often used as a polite expression of hesitation or apology) “he ventured the opinion that Putt was insane” “may I venture to add a few comments?” 
