A lawyer is someone who argues for or against someone who has been accused of doing something bad. If they are arguing that they are innocent, they are a defence lawyer, and if they are arguing that they are guilty they are a prosecution lawyer.
Lawyers specialise in all sorts of fields, like divorce, family law, constitutional law, intellectual property law and many other types of law.
Anyone can be a leader. Being a leader means you are the ruler of something or a great role model for others.