drumlin vs versant

drumlin

noun

  • An elongated hill or ridge of glacial drift. 

versant

noun

  • a slope of a mountain or mountain ridge 

  • the overall slope of a region 

adj

  • conversant 

  • With the wings erect and open. 

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