billowy vs curvilinear

billowy

adj
  • Swelling or swollen into large waves; full of billows or surges; resembling billows. 

curvilinear

adj
  • Formed by curved lines. 

  • Having bends; curved; curvilineal. 

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