averment vs refutation

averment

noun
  • A positive statement of facts; an allegation; an offer to justify or prove what is alleged. 

  • The act of averring, or that which is averred; positive assertion. 

  • verification; establishment by evidence. 

refutation

noun
  • An act of refuting or disproving; the disproving of an argument, opinion, testimony, doctrine or theory by argument or countervailing proof; evidence of falseness. 

  • A vocal answer to an attack on one's assertions. 

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