denialist vs thumbs down

denialist

noun

  • One who denies an assertion in a controversial debate. 

adj

  • Relating to denial in a controversial debate. 

thumbs down

noun

  • A rejection or refusal. 

  • A gesture signifying disapproval; a thumb pointing down out of a fist. 

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