Infrastructure
Part of speech: noun
Definition: An underlying base or foundation especially for an organization or system The basic facilities, services and installations needed for the functioning of a community or society
Example sentence: Developing and newer democracies are much more susceptible to the tactics of populists and demagogues - they often do not have strong institutions, free press, or the infrastructure required to defend their nascent democracies.
Substructure
Part of speech: noun
Definition: The supporting part of a structure (either physical or organizational; the foundation).The earth or gravel that railway sleepers are embedded in.