Doctor, as a title, originates from the Latin word of the same spelling and meaning. A person who is licensed to practice medicine and has trained at a school of medicine, chiropractic, optometry, podiatry, dentistry, or veterinary medicine.
A teacher (also called a school teacher) is a person who provides education for students. The role of teacher is often formal and ongoing, carried out at a school or other place of formal education. In many countries, a person who wishes to become a teacher must first obtain specified professional qualifications or credentials from a university or college. These professional qualifications may include the study of pedagogy, the science of teaching. Teachers, like other professionals, may have to continue their education after they qualify, a process known as continuing professional development. Teachers may use a lesson plan to facilitate student learning, providing a course of study which is called the curriculum.
Labour (also wage labor in American English) is the socioeconomic relationship between a worker and an employer, where the worker sells their labour under a formal or informal employment contract. These transactions usually occur in a labour market where wages are market determined. In exchange for the wages paid, the work product generally becomes the undifferentiated property of the employer, except for special cases such as the vesting of intellectual property patents in the United States where patent rights are usually vested in the original personal inventor. A wage labourer is a person whose primary means of income is from the selling of his or her labour in this way.
lawyerA lawyer is a person who practices law, as an attorney, counsel or solicitor. Law is the system of rules of conduct established by the sovereign government of a society to correct wrongs, maintain the stability of political and social authority, and deliver justice. Working as a lawyer involves the practical application of abstract legal theories and knowledge to solve specific individualized problems, or to advance the interests of those who hire lawyers to perform legal services.
The role of the lawyer varies significantly across legal jurisdictions, and so it can be treated here in only the most general terms
A police force is a constituted body of persons empowered by the state to enforce the law, protect property, and limit civil disorder. Their powers include the legitimized use of force. The term is most commonly associated with police services of a state that are authorized to exercise the police power of that state within a defined legal or territorial area of responsibility. Police forces are often defined as being separate from military or other organizations involved in the defense of the state against foreign aggressors; however, gendarmerie are military units charged with civil policing.