quiver vs quivering

quiver

noun
  • A multidigraph. 

  • A ready storage location for figurative tools or weapons. 

  • A container for arrows, crossbow bolts or darts, such as those fired from a bow, crossbow or blowgun. 

verb
  • To shake or move with slight and tremulous motion. 

quivering

noun
  • A motion by which something quivers or trembles. 

adj
  • shaking, shivering 

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