admirer vs betrothen

admirer

noun

  • One who is romantically attracted to someone. 

  • One who admires. 

betrothen

noun

  • One who is betrothen or betrothed, i.e. a fiancé or fiancée. 

adj

  • Betrothed 

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