low-grade vs privative

low-grade

adj

  • Of inferior quality. 

privative

adj

  • consisting in the absence of something; negative 

  • causing privation; depriving 

  • indicating the absence of something 

noun

  • something that causes privation or indicates an absence 

How often have the words low-grade and privative occurred in a corpus of books? (source: Google Ngram Viewer )