Raj is a four-letter word that can be used in a variety of contexts. In the context of a crossword puzzle, it can refer to a RULE or regulation. In this case, Raj could refer to a set of laws or regulations that govern a particular area or activity. It could also refer to a person who is responsible for enforcing those rules or regulations. Raj could also refer to a system of government or a form of government, such as a monarchy or a democracy. Finally, Raj could refer to a type of music, such as Indian classical music.