gibbering vs piff

gibbering

noun
  • Manic, meaningless speech; babble. 

adj
  • Prone to meaningless vocalization, especially excited and confused utterances, like a beast or monster. 

piff

noun
  • Piffle; nonsense; rubbish. 

intj
  • An exclamation of annoyance or contempt; pish; pshaw. 

verb
  • To throw something vigorously. 

adj
  • good or attractive. 

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