congressman

n. member of a congress (especially of the United States Congress)

A Congressman or Congresswoman is a politician who is a member of a Congress. In countries with a parliament rather than a congress, MP (Member of Parliament) is used instead; however, this can be adapted (see below).
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Noun
1. a member of the United States House of Representatives
(synonym) congresswoman, representative
(hypernym) legislator
(hyponym) rep

(n.)
A member of the Congress of the United States, esp. of the House of Representatives.
  

Synonyms and related words:
MP, Member of Congress, Member of Parliament, alderman, assemblyman, chosen freeholder, city father, congresswoman, councilman, floor leader, lawgiver, lawmaker, legislator, majority leader, minority leader, party whip, representative, senator, solon, state senator, whip