conserve vs hoard

conserve

verb
  • To save for later use, sometimes by the use of a preservative. 

  • To protect an environment, heritage, etc. 

  • To remain unchanged during a process 

noun
  • Wilderness where human development is prohibited. 

  • A jam or thick syrup made from fruit. 

hoard

verb
  • To amass, usually for one's own private collection. 

noun
  • A cache of valuable objects or artefacts; a trove. 

  • A hoarding (temporary structure used during construction). 

  • A hidden supply or fund. 

  • A hoarding (billboard). 

  • A projecting structure (especially of wood) in a fortification, somewhat similar to and later superseded by the brattice. 

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