The Japanese noun '株 (かぶ)' primarily refers to 'stock' in the context of shares or equities in a company. It is commonly used in financial and business settings. For example: I bought stocks「株を買いました」(かぶをかいました). The stock price went up「株価が上がりました」(かぶかがあがりました). Additionally, '株' can also refer to the stump or rootstock of a plant, but this usage is less common in everyday conversation. For example: The tree stump is still there「木の株がまだあります」(きのかぶがまだあります).