overriding vs quelling

overriding

noun

  • The act or process by which something is overridden. 

adj

  • Superior, of supreme importance in the case. 

quelling

noun

  • The act by which something is quelled. 

adj

  • causing something to quell or be quelled 

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