continuant vs imperfective

continuant

noun
  • A linguistic sound other than a stop. 

  • An endurant. 

  • A determinant formed from a tridiagonal matrix. 

adj
  • Continuing; prolonged; sustained. 

imperfective

noun
  • The imperfective aspect; a verb having this aspect. 

adj
  • Of, relating to or having the properties of the imperfective aspect. 

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