encumbrance vs prevention

encumbrance

noun
  • Something that encumbers; a burden that must be carried. 

  • An interest, right, burden, or liability attached to a title of land, such as a lien or mortgage. 

  • One who is dependent on another. 

verb
  • To apply an encumbrance to (property, etc.). 

prevention

noun
  • The act of preventing or hindering; obstruction of action, access, or approach; thwarting. 

  • precaution; forethought. 

  • Any measure intended to limit health-related risks (such as information campaigns, vaccination, early diagnosis etc.). 

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