Mongoloid is a term for certain asians. They share outward traits like epicanthic folds and fattier cheekbones for example. This caused people in the west to associate it with down-syndrome. After a while people realized the unfortunate implication and renamed the medical term âdown-syndromeâ instead.
The answer depends a lot on what country and what institution you're referring to. So there's no single answer. In the US, an instructor (also sometimes called a lecturer) is someone, often without a PhD, whose only job is to teach (part-time or full-time).
Doctor vs Nurse. There has always been a huge difference between a nurse and a doctor. As you might have witnessed yourself, a doctor is the one who does the operations while the nurse is the one who assists him. Hence, what might really be the difference is what they have studied, which is why they reached such professions.