Superstructure

Full definition of superstructure

Noun

1. (nautical) Any structure built above the top full deck. (FM 55-501).
2. Any material structure or edifice built on something else; that which is raised on a foundation or basis
3. all that part of a building above the basement. Also used figuratively.
4. (British) (railroad) The sleepers, and fastenings, in distinction from the roadbed.