hairpiece vs sidelock

hairpiece

noun
  • A false substitute for a person's hair; a toupee or wig. 

sidelock

noun
  • A lock of hair worn at the side of the head. 

  • The design of a gun that has the lockwork mounted to the inside of a plate; compare boxlock. 

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