alteration vs reassessment

alteration

noun
  • The act of altering or making different. 

  • The state of being altered; a change made in the form or nature of a thing; a changed condition. 

reassessment

noun
  • The act of reassessing; a second or subsequent assessment. 

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