kvetching vs malcontent

kvetching

noun

  • Persistent complaining. 

malcontent

noun

  • A person who is not satisfied with current conditions; a discontented person, a rebel. 

adj

  • Dissatisfied with current conditions; disaffected, discontented, rebellious. 

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