alderman vs legislator

alderman

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

  • A long pipe for smoking. 

  • A potbelly, paunch. 

legislator

noun
  • especially a member of a legislative body. 

  • especially not any individual member of a legislative body but the abstracted author of a statute or statutes relevant for the principles of interpretation. 

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