horripilate vs tremble

horripilate

verb

  • To bristle in fear or horror; to have goose bumps or goose pimples. 

tremble

verb

  • To fear; to be afraid. 

  • To shake, quiver, or vibrate. 

noun

  • A shake, quiver, or vibration. 

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