adherent vs betrayer

adherent

adj
  • Adhesive, sticking to something. 

  • Having the quality of clinging or sticking fast to something. 

  • Attaching or pressing against a different organ. 

noun
  • A person who has membership in some group, association or religion. 

betrayer

noun
  • Someone who betrays, or reveals confidential information; a squealer or informer. 

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