conservatory vs polytechnic

conservatory

adj
  • Relating to conservation. 

  • Having the quality of preserving from loss, decay, or injury. 

noun
  • A school of music or drama 

  • A large greenhouse or hothouse for the display of plants 

  • A storehouse. 

  • A glass-walled and -roofed room in a house 

polytechnic

noun
  • A three-year post-secondary vocational training institute, equivalent of community college in the U.S. or TAFE in Australia. 

adj
  • that teaches applied arts, sciences, technology, engineering and other academic subjects 

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