forgetfulness vs reminiscence

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. 

reminiscence

noun
  • An act of remembering long-past experiences, especially positive or pleasant ones, often fondly. 

  • A mental image thus remembered. 

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