continuant vs instantaneous

continuant

adj
  • Continuing; prolonged; sustained. 

noun
  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

  • A linguistic sound other than a stop. 

instantaneous

adj
  • Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time. 

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