What term refers to any large quantity of something?

The term that best refers to any large quantity of something is "stock." In everyday language, "stock" can denote a large supply or inventory of goods or resources that are available for use or sale. This term is commonly used in various contexts, including economics, supply chain management, and inventory control, where it signifies a substantial amount of items held for future use or distribution.

While the other terms, such as "cluster," "batch," and "herd," may imply a grouping of items or entities, they do not necessarily convey the sense of a general large quantity in the same way that "stock" does. "Batch" often refers to a specific amount produced in one process or at one time, "cluster" typically denotes a group of things that are closely gathered together, and "herd" specifically applies to a large group of animals. Therefore, "stock" is the most appropriate term for indicating a large quantity, as it is widely recognized and used in various contexts to signify a substantial amount.