reversal vs right-about

reversal

noun
  • The state of being reversed. 

  • A change in fortune; a change from being successful to having problems. 

  • An instance of reversing. 

adj
  • Intended to reverse; implying reversal. 

right-about

noun
  • A 180-degree turn towards the right (especially of troops) 

How often have the words reversal and right-about occurred in a corpus of books? (source: Google Ngram Viewer )