meliorative vs pejorative

meliorative

adj

  • That meliorates; curative, salutary. 

pejorative

noun

  • A disparaging, belittling, or derogatory word or expression. 

adj

  • Disparaging, belittling or derogatory. 

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