memento vs remnant

memento

noun
  • A keepsake; an object kept as a reminder of a place or event. 

remnant

noun
  • An unsold end of piece goods, as cloth, ribbons, carpets, etc. 

  • The remaining fabric at the end of the bolt. 

  • The small portion remaining of a larger thing or group. 

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