Speculator (noun)

1. A person who buys goods or securities in the hope of selling them at a profit, especially in the short term.
2. A person who takes a risk in the hope of making a profit.

Origin:

Late 16th century: from latin speculator "observer, spy", from speculare "to observe", from specula "a lookout tower".

Examples:

1. He was a successful speculator in the stock market, making a fortune through his investments.
2. Many speculators are willing to take risks in order to make a quick profit.
3. The real estate market was attracting a lot of speculators, looking to make a profit from the rising prices.
4. The stock market was unstable, with speculators buying and selling shares rapidly in an attempt to make a profit.
5. Some speculators use insider information to make informed decisions, while others rely purely on intuition and luck.