ignore vs ponder

ignore

verb
  • To deliberately not listen or pay attention to. 

  • To pretend to not notice someone or something. 

ponder

verb
  • To wonder, think of deeply. 

  • To consider (something) carefully and thoroughly. 

noun
  • A period of deep thought. 

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