Master: Master is a general term. For example, when asking for directions, a middle-aged man or woman who doesn't know how to call him is a master. Or just as a technician is called a master in a factory, the apprentice brought by this master will also call him a master.
Teachers: Teachers in a broad sense refer to people who impart knowledge and experience, and teachers in a narrow sense refer to people who have received special education and training and are engaged in education and teaching in an education (school). Teachers in a narrow sense refer to professionals who, through special education and training, impart human scientific and cultural knowledge and skills to students, develop students' physique, educate students in ideology and morality, cultivate students' noble aesthetic taste, and train the educated into talents needed by society.