What is another word for sub structures?
Pronunciation: [sˈʌb stɹˈʌkt͡ʃəz] (IPA) 
Sub structures, also known as subterranean structures, refer to the hidden or underground structural components of buildings or infrastructure. There are several synonyms that can be used instead of sub structures such as underground structures, basement structures, subterranean spaces, foundation systems, below-grade structures, sub levels, and base structures. These terms refer to the components of a building or a construction project that are crucial for its stability and durability. Architects, engineers, contractors and construction crews must pay special attention to sub structures during project planning and development. Synonyms for sub structures help to provide a better understanding of the various components and stages involved in construction.
