The term 'Sith Rivals' refers to the two opposing forces in the Star Wars universe, the Jedi and the Sith. The Jedi are a noble order of protectors unified by their commitment to peace and justice, while the Sith are a dark side order of Force-wielders who seek power and domination. The crossword solution for the term 'Sith Rivals' is 'Jedi, ' which is the four-letter word associated with the noble order of protectors.