quiver vs quop

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. 

quop

verb
  • To throb or beat. 

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