headrest vs piper

headrest

noun
  • The part of a seat designed to support the sitter's head. 

piper

noun
  • A common European gurnard (Trigla lyra), having a large head, with prominent nasal projection, and with large, sharp, opercular spines. 

  • A bagpiper. 

  • A musician who plays a pipe. 

  • A baby pigeon. 

  • A sea urchin (Cidaris cidaris) with very long spines, native to the American and European coasts. 

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