Difference between psychotropics and narcotics ?

See below: A psychoactive drug, psychopharmaceutical, or psychotropic is a chemical substance that crosses the blood–brain barrier and acts primarily upon the central nervous system where it affects brain function, resulting in alterations in perception, mood, consciousness, cognition, and behavior. Narcotics in the United States is associated with opioids, commonly morphine, hydrocodone and oxycodone.

Subtle: Psychotropic drugs cross into the brain, act on the central nervous system and are mood altering. Narcotics have receptors in the central nervous system and to the the degree they are generally euphoric they are mood altering. However i don't believe that most people consider them to be psychotropic per se.