The term "acme screw thread" is a specific type of screw thread used in various applications. However, there are several synonyms for this term, including trapezoidal screw threads, square threads, and buttress threads. Trapezoidal screw threads are similar to acme threads, but have a smaller angle and a higher load-carrying capacity. Square threads are a type of acme screw thread that's square-shaped and used in low-stress applications. Buttress threads feature a load-carrying rib, making them ideal for heavy-duty applications. Each of these synonyms for acme screw threads has their specific uses and advantages, but they all offer reliable and efficient ways to transfer power and motion.