carping vs protestation

carping

noun
  • Excessive complaining. 

adj
  • complaining excessively. 

protestation

noun
  • A declaration in common-law pleading, by which the party interposes an oblique allegation or denial of some fact, protesting that it does or does not exist, and at the same time avoiding a direct affirmation or denial. 

  • a formal solemn objection or other declaration 

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