justify vs sustain

justify

verb
  • To prove; to ratify; to confirm. 

  • To absolve, and declare to be free of blame or sin. 

  • To be a good, acceptable reason for; warrant. 

  • To qualify (oneself) as a surety by taking oath to the ownership of sufficient property. 

  • To arrange (text) on a page or a computer screen such that the left and right ends of all lines within paragraphs are aligned. 

  • To provide an acceptable explanation for. 

  • To give reasons for one’s actions; to make an argument to prove that one is in the right. 

  • To show (a person) to have had a sufficient legal reason for an act that has been made the subject of a charge or accusation. 

sustain

verb
  • To confirm, prove, or corroborate; to uphold. 

  • To provide for or nourish. 

  • To encourage or sanction (something). 

  • To maintain, or keep in existence. 

  • To allow, accept, or admit (e.g. an objection or motion) as valid. 

  • To keep from falling; to bear; to uphold; to support. 

  • To aid, comfort, or relieve; to vindicate. 

  • To experience or suffer (an injury, etc.). 

noun
  • A mechanism which can be used to hold a note, as the right pedal on a piano. 

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