cooperation vs encumbrance

cooperation

noun
  • The act of cooperating. 

  • Association for mutual benefit, such as for purposes of production or purchase. 

  • Active help from a person, organization, etc., such as an orderly sharing of space or resources. 

encumbrance

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

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

  • One who is dependent on another. 

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

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