IPA: /ˌɛnˈdɔr.fɪn/
KK: /ɛnˈdɔr.fɪn/
A type of hormone produced in the brain that helps relieve pain and can improve mood.
After exercising, many people feel a rush of endorphins that makes them feel happy.
Endorphin is formed from "endo-" (meaning within) and "orphin" (derived from the Greek word "orphanos", meaning orphan). The word refers to substances produced within the body that can relieve pain and induce feelings of pleasure, akin to the way an orphan might seek comfort.
Think of something that comes from 'within' ('endo-') the body to provide comfort or relief, similar to how an orphan seeks solace.
No commonly confused words.