adherent vs maintainer

adherent

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

adj
  • Adhesive, sticking to something. 

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

  • Attaching or pressing against a different organ. 

maintainer

noun
  • Someone who keeps or upholds something; a steward. 

  • A device used to keep teeth in a given position. 

  • A person who does maintenance work. 

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