"Culprit" is a synonym for "culsu," meaning the person responsible for a crime or wrongdoing. Other synonyms include "guilty party," "offender," "wrongdoer," and "malefactor." "Perpetrator" and "miscreant" are also similar terms used to describe someone who commits a crime or engages in wrongful behavior. In a legal context, "defendant" or "accused" may be interchangeable with "culprit," depending on the circumstances. While these words have similar meanings, they may carry slightly different connotations and are often used in specific contexts. Overall, these synonyms serve as useful alternatives when writing or speaking about those who are responsible for improper or illegal actions.