A lawyer or an attorney (the two terms are synonymous).
Lawyers/attorneys
It is a lawyer or an attorney.
Lawyer
Lawyers
The court that deals about crimes and consists criminal law.
Do you mean studying law? If so yes, a person may represent or defend themselves in court proceedings, both civil and criminal. However there is a saying "anyone who represents themselves in court has a fool for a client".
A plaintiff is a person who brings an action against another in a court of law
A lawsuit is an action a person takes in the court of law when they feel wronged by another person or company seeking money from damages.
You'll need more than a law degree to represent someone else in court. You need a license to practice law.
Counsel.
The main feature of common law is that this type of law represents the judicial decisions within the court system. The main feature of statute law is that it represents the wishes and beliefs of the legislature.
An attorney-at-law is a person with a law degree that represents people in legal matters. There is another kind of attorney, though. An attorney-in-fact is someone who is granted power of attorney with respect to another person's affairs. An attorney-in-fact is not necessarily a lawyer, just a person who is empowered to make decisions for someone else.
Lying negatively about another person is slander if said to another person; libel if written in a published medium or perjury is spoken under oath in a legal statement or court of law.
A writ of summons is another term for a summons, a notice in law summoning a person to appear in court, such as a defendant, a juror or a witness.
plaintiff
The noun 'advocate' is a word for someone who publicly supports or recommends a particular cause or policy; a word for someone who pleads the cause of another in a court of law; a word for a person. The word 'advocate' is also a verb: advocate, advocates, advocating, advocated.