pillow vs throw pillow

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. 

throw pillow

noun
  • A small pillow, especially one placed on a chair or sofa rather than on a bed, used for decoration rather than comfort. 

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