quiver vs tremor

quiver

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

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. 

tremor

verb
  • To shake or quiver excessively and rapidly or involuntarily; to tremble. 

noun
  • An earthquake. 

  • A shake, quiver, or vibration. 

  • A rhythmic, uncontrollable shaking of all or part of the body due to partial muscle contractions. 

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