podium vs substructure

podium

noun
  • The masonry under the stylobate of a temple, sometimes a mere foundation, sometimes containing chambers. 

  • A result amongst the best three at a competition. 

  • A platform on which to stand, as when conducting an orchestra or preaching at a pulpit; any low platform or dais. 

  • The dwarf wall surrounding the arena of an amphitheatre, from the top of which the seats began. 

  • A foot or footstalk. 

  • A steepled platform upon which the three competitors with the best results may stand when being handed their medals or prize. 

  • A stand used to hold notes when speaking publicly. 

verb
  • To finish in the top three at an event or competition. 

substructure

noun
  • The supporting part of a structure (either physical or organizational; the foundation). 

  • The earth or gravel that the railway tracks are embedded in. 

  • Synonym of base (“the forces and relations of production that produce the necessities and amenities of life”) 

How often have the words podium and substructure occurred in a corpus of books? (source: Google Ngram Viewer )