continuant vs endless

continuant

adj

  • Continuing; prolonged; sustained. 

noun

  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

  • A linguistic sound other than a stop. 

endless

adj

  • Extending indefinitely. 

  • Having no end. 

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