folly vs silliness

folly

noun
  • Foolishness that results from a lack of foresight or lack of practicality. 

  • a pinkish-red color 

  • A fanciful building built for purely ornamental reasons. 

  • Thoughtless action resulting in tragic consequence. 

silliness

noun
  • That which is perceived as silly or frivolous. 

  • An act that is silly; a result of being silly. 

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