Bayer vs aspirin powder

Bayer and aspirin powder both are nouns.

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

As nouns, aspirin powder is a hyponym of Bayer; that is, aspirin powder is a word with a more specific, narrower meaning than Bayer:

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
aspirin powder: a powdered form of aspirin

Other hyponyms of Bayer include headache powder, buffered aspirin, Bufferin, enteric-coated aspirin.

Bayer (noun)	aspirin powder (noun)
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	a powdered form of aspirin