What is the difference between opiate and narcotic analgesic?

Usually the same: For practical purposes in healthcare, the words are equivalent. Originally, "narcotic" was used more generally, especially for a sleep-inducing substance. It also has legal/regulatory implications as used by dea. Opiates and opioids are morphine-like drugs that are primarily used to treat pain. In the us healthcare environment, we usually use the words opioid, opiate, and narcotic interchangeably.

Same: They are esentially refering to the same class of medicines. Opiates refer to drugs that act specifically at opiate receptors, as do the narcotics.

None: They are just two different names for the same medications.

The same: They are two words that describe the same thing.