The word chainman generally refers to a person who assists with surveying activities. Some synonyms for chainman would include rodman, chain bearer, and levelman. A rodman uses a rod to measure distances, while a chain bearer carries a chain to measure distances. A levelman is responsible for using a level to determine the heights of various points. All these individuals contribute to the accuracy of surveying measurements. In addition to these synonyms, there may be regional variations in the terminology used for these positions, so it's always important to clarify the specific roles and responsibilities associated with any particular surveying project.