(also ‘venturer‘; plural: ‘adventurers‘; for the right pronunciation, please click here)
a person who likes or looks for adventures, such as daring, dangerous, risky activities/things; going to unknown and/or dangerous places, either for money or pleasure;
a person who invests his/her money on some business, such as stocks, bonds, securities, real estate, etc., without knowing the real facts or without considering the risks he/she may face later — just on bold guess work, so that, if everything goes according to plan, he/she gets huge profits, and, if anything goes wrong in the process, he/she loses everything; a speculator;
a person who does illegal business in order to get quick money or quick popularity although he/she knows the high risks involved in doing so; a gambler; a fortune-hunter;
a soldier who serves any army just for money or to get the thrills of fighting and killing; a mercenary; a soldier of fortune,
Indiana Jones in the Hollywood movie serial is an adventurer.
One of my cousins is an adventurer; he made a lot of money in stock market.
It is reported that many adventurers from Europe and America serve different armies in Africa just for money. (i.e. retired soldiers from Europe and America go to Africa and join the army of any country there which can pay them good money and fight for them against any other country)