damper vs damper block

damper and damper block both are nouns.

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

As nouns, damper block is a hyponym of damper; that is, damper block is a word with a more specific, narrower meaning than damper:

damper: a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations
damper block: damper consisting of a small felted block that drops onto a piano string to stop its vibration

Other hyponyms of damper include piano damper, dash-pot, cushion, shock, shock absorber.

damper (noun)	damper block (noun)
a depressing restraint	damper consisting of a small felted block that drops onto a piano string to stop its vibration
a device that decreases the amplitude of electronic, mechanical, acoustical, or aerodynamic oscillations
a movable iron plate that regulates the draft in a stove or chimney or furnace