When it comes to finding synonyms for the term "tractor trailer," there are a few different options to consider. One common alternative term is "semi-truck," which refers to a large truck consisting of a tractor unit and a trailer. Another option is "18-wheeler," which is a term often used to describe large trucks with 18 wheels in total. Some other lesser-known synonyms for tractor trailer may include "big rig," "articulated lorry," or simply "truck and trailer." No matter which term you choose to use, it is important to understand that these vehicles play a crucial role in transporting goods across the country and are a vital part of the transportation industry.