curler vs hair curler

curler

noun
  • One of a set of small cylindrical tubes used to curl hair. 

  • A pass or a shot of the ball which swerves. 

  • A sportsman who plays curling. 

hair curler

noun
  • synonym of hair roller 

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