continuant vs round-the-clock

continuant

adj

  • Continuing; prolonged; sustained. 

noun

  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

  • A linguistic sound other than a stop. 

round-the-clock

adj

  • continuous; incessant; without interruption; all day long, 24 hours per day; nonstop: from the concept that it happens while the hands of the clock go all the way around. 

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