dilapidation vs dry rot

dilapidation

noun
  • The state of being dilapidated, reduced to decay, partially ruined. 

  • Ecclesiastical waste: impairing of church property by an incumbent, through neglect or intentionally. 

  • The act of dilapidating, damaging a building or structure through neglect or intentionally. 

  • Money paid at the end of an incumbency by the incumbent or his heirs for the purpose of putting the parsonage etc. in good repair for the succeeding incumbent. 

dry rot

noun
  • Any progression of decay, corruption, or obsolescence. 

  • The crumbly, friable decayed portions of wooden members of buildings, especially at or below grade, usually caused by a fungal infection. 

  • A fungal infection which affects plants, in particular potatoes. 

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