continuant vs perseverant

continuant

adj

  • Continuing; prolonged; sustained. 

noun

  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

  • A linguistic sound other than a stop. 

perseverant

adj

  • Enduring; persistent, resistant. 

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