Tylenol vs pain pill

Tylenol and pain pill both are nouns.

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

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

Tylenol: 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 Tylenol include analgesic, anodyne, painkiller.

Tylenol (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