abirritate vs assuage

abirritate

verb
  • To diminish the sensibility of; to debilitate; to soothe. 

assuage

verb
  • To lessen the intensity of, to mitigate or relieve (hunger, emotion, pain etc.). 

  • To pacify or soothe (someone). 

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