piano damper vs damper block

piano damper and damper block both are nouns.

Word	Noun	Adjective	Verb	Adverb
piano damper	Yes	No	No	No
damper block	Yes	No	No	No

As nouns, piano damper and damper block are synonyms defined as:

piano damper and damper block: damper consisting of a small felted block that drops onto a piano string to stop its vibration

piano damper (noun)	damper block (noun)
damper consisting of a small felted block that drops onto a piano string to stop its vibration	damper consisting of a small felted block that drops onto a piano string to stop its vibration