Panadol vs pain pill

Panadol and pain pill both are nouns.

Word	Noun	Adjective	Verb	Adverb
Panadol	Yes	No	No	No
pain pill	Yes	No	No	No

As nouns, pain pill is a hypernym of Panadol; that is, pain pill is a word with a broader meaning than Panadol:

Panadol: 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)
pain pill: a medicine used to relieve pain

Other hypernyms of Panadol include analgesic, anodyne, painkiller.

Panadol (noun)	pain pill (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)	a medicine used to relieve pain