A counselor is the person you can consult in your time of need. Your school guidance counselor may suggest you take Spanish class next school year. Bueno?
How you define counselor depends on where you are at the time. In court, a counselor is the lawyer who gives clients advice on legal issues and pleads their case in court. During a therapy session, a counselor helps people understand and resolve personal issues. And at summer camp, a counselor is the person who supervises the children's activities and makes sure they stay safe.