"Opioids" differ from "opiates" in that they are:
High-Yield Explanation
Opiods are synthetics while opiates are semi synthetic. Opiods include pethidine,fentanyl,methadone,dextropropoxyphene,tramadol. Semisynthetic opiates include heroin ,pholcodine,ethylmorphine . Ref: KD Tripathi 8th ed.