trembler vs tremor

trembler

noun
  • The vibrating hammer, or spring contact piece of a hammer break, as of the electric ignition apparatus for an internal combustion engine. 

  • One who, or that which, trembles. 

  • Any of various New World passerine birds of the family Mimidae. 

tremor

noun
  • A shake, quiver, or vibration. 

  • An earthquake. 

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

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

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