souvenir vs waypost

souvenir

noun
  • An item of sentimental value, that is given or kept to remember an event or location. 

verb
  • To take (something) as a souvenir, especially illicitly, for example during wartime. 

waypost

noun
  • Something that guides or marks the way along a figurative journey; a temporary stopping point. 

  • A sign or other marker that indicates the way along a road or trail. 

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