completion vs inception

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. 

inception

noun
  • The creation or beginning of something; the establishment. 

  • A layering, nesting, or recursion of something. 

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