superstructure ( synonym found)
Definition of superstructure:

(n) : any structure built above the top full deck. (FM 55-501); any material structure or edifice built on something else; that which is raised on a foundation or basis
Definition of superstructure:

(n) : any structure built above the top full deck. (FM 55-501); any material structure or edifice built on something else; that which is raised on a foundation or basis
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