投機 (tōki) means “speculation” | MotiTan Japanese Dictionary

More examples

株価の変動が激しい時期は、投機に手を出さないほうが安全です。kabu ka no hen dō ga hage shi i ji ki wa tō ki ni te o da sa na i hō ga an zen de su

When stock prices are highly volatile, it is safer not to engage in speculation.

Centers on putting money at risk based on an expected price change rather than holding an asset for its lasting use or value.

投資tōshi: Putting money into an asset to seek returns from its use, growth, or lasting value.

利益を得ようとして、価格の変動を見込んで商品や証券などを売買すること。ri eki o e yō to shi te ka kaku no hen dō o mi ko n de shō hin ya shō ken na do o bai bai su ru ko to

投機 (tōki) is a Sino-Japanese compound of 投 (tō, "throw") and 機 (ki, "chance"), expressing resources being thrown onto a chance of gain.

In English, speculation can mean either an unproven idea or risky trading, while 投機 (tōki) chiefly refers to the latter, especially when price changes are the source of expected profit.