piano action vs piano damper

piano action and piano damper both are nouns.

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

piano action (noun)	piano damper (noun)
action consisting of a system of levers that move a felt hammer to strike the strings when a key is depressed	damper consisting of a small felted block that drops onto a piano string to stop its vibration