IPA: /ˈspɛkjʊleɪtə/
KK: /ˈspɛkjʊˌleɪtə/
A person who makes risky investments in the hope of making a profit, often by buying and selling stocks, real estate, or other assets.
The speculator bought shares in the company, hoping their value would increase.
Speculator → It is formed from "specula" (meaning a watchtower or observation) and the suffix "-tor" (meaning one who). The word "speculator" refers to one who observes or watches, often in a context of investment or speculation.
Think of someone who is 'watching' or 'observing' ('specula') to make decisions, which is why a speculator is someone who observes the market.