plurilingual vs two-tongued

plurilingual

adj
  • of or pertaining to several languages 

two-tongued

adj
  • Possessing the ability to speak two languages; synonym of bilingual. 

  • Deceitful; lying; two-faced. 

  • Having two tongues; double-tongued. 

How often have the words plurilingual and two-tongued occurred in a corpus of books? (source: Google Ngram Viewer )