bumpy vs convulsive

bumpy

adj
  • covered with or full of bumps 

  • rough; jumpy; causing or characterized by jolts and irregular movements 

convulsive

adj
  • Marked by or having the nature of convulsions. 

  • Having or producing convulsions. 

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