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There are 2 words beginning with OPIO

OPIOID• opioid n. A substance that has effects similar to opium.
• opioid n. (Physiology) Any of the natural substances, such as an endorphin, released in the body in response to pain.
• opioid n. (Pharmacology) Any of a group of synthetic compounds that exhibit similarities to the opium alkaloids…
OPIOIDS• opioids n. Plural of opioid.
• OPIOID n. a peptide that acts like opium.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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