betrothed vs marriageable

betrothed

noun

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

adj

  • Engaged to be married. 

marriageable

noun

  • One who is suitable for marriage. 

adj

  • Suitable for marriage; nubile. 

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