countercheck vs equipoise

countercheck

verb
  • To restrict or limit by counteracting. 

  • To recheck. 

noun
  • A second check (in order to confirm or deny a previous one). 

  • A restriction or limit. 

equipoise

verb
  • To cause to be or stay in equipoise. 

  • To act or make to act as an equipoise. 

noun
  • A state of balance; equilibrium. 

  • A counterbalance. 

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