What is another word for sub-stratum?
Pronunciation: [sˈʌbstɹˈɑːtəm] (IPA) 
Sub-stratum refers to the layer of material beneath the surface of something. There are several synonyms that can be used to describe this underlying layer, such as foundation, base, groundwork, substratum, and substructure. These terms can be applied to a variety of contexts, including geology, architecture, and linguistics. In geology, the substratum refers to the rock or soil beneath the top layer, while in architecture, the term is used to describe the supporting structure beneath a building. Similarly, in linguistics, the substructure refers to the underlying components or features that shape the surface form of language. Whether used in a scientific or practical context, these synonyms for sub-stratum provide a clear and concise way to describe the foundation or underlying layer of something.
