What is another word for under-structure?
Pronunciation: [ˌʌndəstɹˈʌkt͡ʃə] (IPA) 
When we talk about the "under-structure" of something, we're typically referring to the foundation or framework that supports it. However, there are several synonyms we can use instead to convey this same concept. For instance, we might use "substructure," which refers specifically to the parts of the foundation that are below ground level. Another option is "base," which can encompass both the underlying structure and any additional supports that help hold something up. Other possible synonyms for "under-structure" include "framework," "skeleton," and "footing," among others. No matter the term we choose, it's important to remember that the under-structure is a critical aspect of any building or structure, providing the necessary support and stability for everything else that comes after.
