alderman vs assemblymember

alderman

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

  • A long pipe for smoking. 

  • A potbelly, paunch. 

assemblymember

noun
  • A person who serves as a member of an assembly. 

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