What is the name of the lower house in the United States' bicameral legislature?

The correct name for the lower house in the United States' bicameral legislature is the House of Representatives. This body is responsible for creating and passing legislation, and its members are elected directly by the people of their respective congressional districts. The House is differentiated from the Senate, which is the upper house where elected representatives serve longer terms and represent larger constituencies.

Understanding the structure of Congress, which includes both the House of Representatives and the Senate, highlights the unique functions and powers each chamber possesses. While 'Congress' refers to the entirety of both chambers, and 'Legislative Assembly' is a term typically used in other contexts or at state levels, the specific term for the lower house remains the House of Representatives.