alderman vs congresswoman

alderman

noun
  • A member of a municipal legislative body in a city or town. 

  • A long pipe for smoking. 

  • A potbelly, paunch. 

congresswoman

noun
  • A female member of the House of Representatives 

  • A female member of congress 

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