Anodyne and Phenaphen

Anodyne noun - Something (as a drug) that relieves pain.

Phenaphen and anodyne are semantically related. In some cases you can replace term "Phenaphen" with "Anodyne", this nouns are similar.

Phenaphen noun - An analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets).

Anodyne and Phenaphen are semantically related. You can use "Anodyne" instead a noun "Phenaphen".