Difference between teacher and doctor
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Teacher is a person who helps students to acquire knowledge, competence or virtue. Informally the role of teacher may be taken on by anyone.

Teacher often works in a classroom. ... Most teachers use a variety of methods to teach. Teachers often explain new knowledge, write on a blackboard or whiteboard, sit behind their desks on chairs, help students with their work, or mark students' work.

Where as

Regardless of specialty, doctors face the challenge of diagnosing and treating human disease, ailments, injuries, pain, or other conditions. This is done by listening to the patient, understanding the problem

The job of a doctor is to diagnose and treat illness and injury. Doctors examine patients and arrive upon diagnosis, perform surgeries, prescribe medications, educate patients and their family members, check patients' records and keep an eye on their recovery

b. the colonies must seek protection from other nations.