newspeak vs slanguage

newspeak

noun
  • Use of ambiguous, misleading, or euphemistic words in order to deceive the listener, especially by politicians and officials. 

slanguage

noun
  • A particular vernacular or vocabulary of slang; the jargon or lingo of a particular group. 

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