dais vs gantry

dais

noun
  • A raised platform in a room for a high table, a seat of honour, a throne, or other dignified occupancy, such as ancestral statues; a similar platform supporting a lectern, pulpit, etc., which may be used to speak from. 

  • The canopy over an altar, etc. 

  • A bench, a settle, a pew. 

gantry

noun
  • A gantry crane or gantry scaffold. 

  • A supporting framework for a barrel. 

  • A framework of steel bars resting on side supports to bridge over or around something. 

  • A cylindrical scanner assembly in the bore of which the response of bodies or tissues to some specific exposure can be detected for 3D imaging. 

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