cheekpiece vs chinstrap

cheekpiece

noun
  • A piece of armour, or the bridle of a horse, that protects the cheek. 

chinstrap

noun
  • A strip of leather or material used to fasten a hat or helmet under the chin. 

  • A form of beard that follows the jawline but does not cover the rest of the chin. 

  • A band of colour below a bird's mouth, resembling the chinstrap of a helmet. 

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