headache powder vs Bayer

headache powder and Bayer both are nouns.

Word	Noun	Adjective	Verb	Adverb
headache powder	Yes	No	No	No
Bayer	Yes	No	No	No

As nouns, Bayer is a hypernym of headache powder; that is, Bayer is a word with a broader meaning than headache powder:

headache powder: a powdered form of aspirin
Bayer: the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets

Other hypernyms of headache powder include acetylsalicylic acid, aspirin, Empirin, St. Joseph, powder.

headache powder (noun)	Bayer (noun)
a powdered form of aspirin	the acetylated derivative of salicylic acid; used as an analgesic anti-inflammatory drug (trade names Bayer, Empirin, and St. Joseph) usually taken in tablet form; used as an antipyretic; slows clotting of the blood by poisoning platelets