completion vs graduation

completion

noun
  • The act or state of being or making something complete; conclusion, accomplishment. 

  • The space resulting from such an act. 

  • The conclusion of an act of conveyancing concerning the sale of a property. 

  • The act of making a metric space complete by adding points. 

  • A forward pass that is successfully caught by the intended receiver. 

graduation

noun
  • The action or process of graduating and receiving a diploma for completing a course of study (such as from an educational institution). 

  • A commencement ceremony. 

  • The action or process of graduating (leaving a group). 

  • The exposure of a liquid in large surfaces to the air, so as to hasten its evaporation. 

  • A marking (e.g., on a container) indicating a measurement on a scale, usually one of many such markings. 

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