Bufferin vs buffered aspirin

Bufferin and buffered aspirin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bufferin	Yes	No	No	No
buffered aspirin	Yes	No	No	No

As nouns, Bufferin and buffered aspirin are synonyms defined as:

Bufferin and buffered aspirin: aspirin coated with a substance capable of neutralizing acid (trade name Bufferin)

Bufferin (noun)	buffered aspirin (noun)
aspirin coated with a substance capable of neutralizing acid (trade name Bufferin)	aspirin coated with a substance capable of neutralizing acid (trade name Bufferin)