Grillage refers to a network of steel or iron beams used for supporting construction and is often called a grillage beam or grillage foundation. Synonyms for grillage include a platform, foundation, base, framework, footing, substructure, understructure, and underpinning. Other similar words for grillage could be structures, supporting system, or undergirding. Uses for grillage include bridge building, constructing large structures like buildings, or even used as a foundation for offshore structures like oil rigs. Understanding synonyms for grillage is essential for engineers and construction professionals as it allows for better communication between colleagues and a better understanding of a specific project's requirements.