Stock-out is a situation where a business has no inventory of a particular product or item. This scenario can be frustrating for both customers and business owners. However, there are several synonyms for stock-out that can be used in different contexts. Some of these words include out of stock, sold out, shortage, unavailability, absence, depletion, and lack of inventory. These synonyms can be used interchangeably to refer to the same situation, but they often carry different nuances and implications. When a business experiences a stock-out, it needs to take immediate action to restock its inventory to avoid losing customers and revenue.