Proposal: A proposal refers to a formal suggestion or idea put forward for consideration. In terms of amendments, it represents when an amendment is introduced by Congress or through other methods.
Supermajority: A supermajority is a greater than simple majority vote required for certain decisions or actions. In case of amending the Constitution, ratification usually requires approval from three-fourths (or 38) out of 50 states' legislatures.
Suffrage: Suffrage simply means "the right to vote." It encompasses both men's suffrage (which existed earlier) and the fight for women's suffrage.