earthquake vs quaver

earthquake

noun
  • A shaking of the ground, caused by volcanic activity or movement around geologic faults. 

  • Such a quake specifically occurring on the planet Earth, as opposed to other celestial bodies. 

verb
  • To undergo an earthquake. 

quaver

noun
  • A trembling shake. 

  • an eighth note, drawn as a crotchet (quarter note) with a tail. 

  • A trembling of the voice, as in speaking or singing. 

verb
  • To shake in a trembling manner. 

  • To use the voice in a trembling manner, as in speaking or singing. 

  • To utter quaveringly. 

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