pillion vs piper

pillion

noun
  • The cushion of a saddle. 

  • The person riding in the pillion. 

  • A similar second saddle on a motorcycle for a passenger. 

  • A pad behind the saddle of a horse for a second rider. 

adv
  • Riding behind the driving rider, as when positioned on the rump of a mount. 

verb
  • To ride on a pillion. 

  • To put a pillion on a horse. 

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 pillion and piper occurred in a corpus of books? (source: Google Ngram Viewer )