dampen vs dampening

dampen is not a noun while dampening is a noun.

Word	Noun	Adjective	Verb	Adverb
dampen	No	No	Yes	No
dampening	Yes	No	No	No

dampen (noun)	dampening (noun)
	the act of making something slightly wet

dampen (verb)	dampening (verb)
lessen in force or effect
make moist
check; keep in check (a fire)
make vague or obscure or make (an image) less visible
reduce the amplitude (of oscillations or waves)
suppress or constrain so as to lessen in intensity
deaden (a sound or noise), especially by wrapping