The word **买主** (mǎizhǔ) is formed through a standard Chinese compound word structure where the verb **买** (mǎi, "to buy") is combined with the noun **主** (zhǔ, "master" or "owner"). This creates a **verb-object relationship** within the compound, literally meaning "the master/party of buying." Functionally, it follows a common agentive pattern where the action (买) precedes the agent who performs it (主), resulting in the meaning "buyer" or "purchaser," specifying the person who takes the primary role in a transaction.