predominancy vs preponderance

predominancy

noun
  • Predominance. 

preponderance

noun
  • Superiority of influence, power, a quality, etc.; an outweighing, predominance, pre-eminence. 

  • Superiority in amount or number; the bulk or majority; also, a large amount or number; an abundance, a profusion. 

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