acknowledging vs forgetfulness

acknowledging

adj
  • That acknowledges, in various sense; (especially) that notices or recognises someone or something. 

forgetfulness

noun
  • Loss of remembrance or recollection; a ceasing to remember; oblivion. 

  • The quality of being forgetful; proneness to let slip from the mind. 

  • Failure to bear in mind; careless omission; inattention. 

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