A bill is a proposed new law. When a bill is passed in identical form by both the Senate and the House, it is sent to the president for his signature. If the president signs the bill, it becomes a law. Laws are also known as Acts of Congress. Statute is another word that is used interchangeably with law.
Regulations: Rules and administrative codes issued by government agencies at all levels (municipal, county, state, and federal) Have the force of law.
Statues: Federal or state written laws (or "acts") enacted by Congress or state legislatures
Joint Resolutions
Simple Resolutions
Concurrent Resolutions
Source: Johnson, Charles W. "How Our Laws Are Made." Washington: U.S. Government Printing Office, 2003.
The Massachusetts Legislature website has a tool to demonstrate how bills are introduced and passed into law at the state level.