I got a pleasantly surprising answer from dolphin-mixtral. I was expecting it to follow the IRS or ETF crowd and say "stock."

> Bitcoin is more like money than stocks because it functions as a medium of exchange and a store of value, similar to traditional currencies. While there are some similarities with stocks (such as being subject to market fluctuations), the primary purpose of Bitcoin is not for investment or ownership in a company but rather for use as digital cash.