helper vs rebel

helper

noun
  • That which helps; anything serving to assist. 

  • One who helps; an aide; assistant; auxiliary. 

  • A locomotive that assists a train, usually on steep gradients. 

  • A person who does cleaning and cooking in a family home, or in a market; domestic employee. 

rebel

noun
  • Synonym of Confederate: a citizen of the Confederate States of America, especially a Confederate soldier. 

  • A person who resists an established authority, often violently. 

verb
  • To resist or become defiant toward an authority. 

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