continuant vs imperishable

continuant

adj
  • Continuing; prolonged; sustained. 

noun
  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

  • A linguistic sound other than a stop. 

imperishable

adj
  • not perishable; not subject to decay; enduring permanently 

noun
  • something that does not perish, or keeps for a long time 

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