palpitate vs quiver

palpitate

verb
  • To shake tremulously 

  • To beat strongly or rapidly; said especially of the heart. 

  • To cause to beat strongly or rapidly. 

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. 

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