continuant vs groove fricative

continuant

noun
  • A linguistic sound other than a stop. 

  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

adj
  • Continuing; prolonged; sustained. 

groove fricative

noun
  • A hissing or hushing sound such as the s or sh in sack or shack. 

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