The lightsaber, sometimes referred to as a laser sword, is a weapon used by the Jedi, the Sith, and other Force-sensitives. Lightsabers consist of a plasma blade, powered by a kyber crystal, that is emitted from a usually metal hilt and can be shut off at will.
An article (abbreviated ART) is a word (or prefix or suffix) that is used with a noun to indicate the type of reference being made by the noun.
An article is something that was part of the constitution as originally written. An amendment is something added to the constitution latter on to correct some perceived flaw. What are referred to as the Bill of Rights are amendments added to the constitution to get the states to ratify it in the first place.