pillion vs pillow

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. 

verb
  • To ride on a pillion. 

  • To put a pillion on a horse. 

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

pillow

noun
  • A soft cushion used to support the head in bed. 

  • A pillow lava. 

  • The socket of a pivot. 

  • A block under the inner end of a bowsprit. 

  • A kind of plain, coarse fustian. 

  • A piece of metal or wood, forming a support to equalize pressure; a brass; a pillow block. 

verb
  • To rest as on a pillow. 

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