Flat tire is a common term used to describe the situation when a tire loses air pressure, making it unusable. However, there are other synonyms used to describe the same problem, such as blown tire, punctured tire, and deflated tire. A blown tire usually refers to when a tire ruptures or bursts due to excessive pressure. A punctured tire, on the other hand, is when a sharp object pierces through the tire and causes it to lose air. Deflated tire is a more general term that can refer to any situation where a tire loses its pressure. In any case, a flat tire is an inconvenience that can cause delays and frustration, but it is easily fixable with the right tools and knowledge.