cover story vs justification

cover story

noun
  • A fictitious account that is intended to hide one's real motive. 

  • A story included in a publication that is highlighted on the front cover. 

justification

noun
  • A reason, explanation, or excuse which someone believes provides convincing, morally acceptable support for behavior or for a belief or occurrence. 

  • The forgiveness of sin. 

  • The alignment of text to the left margin (left justification), the right margin (right justification), or both margins (full justification). 

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