gibbering vs waffler

gibbering

noun
  • Manic, meaningless speech; babble. 

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

waffler

noun
  • One who waffles or rambles; a vague, unfocused speaker or writer. 

  • A waffle iron. 

  • One who waffles, or changes sides or positions frequently. 

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