suddenness vs precipitousness

suddenness and precipitousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
suddenness	Yes	No	No	No
precipitousness	Yes	No	No	No

As nouns, suddenness and precipitousness are synonyms defined as:

suddenness and precipitousness: the quality of happening with headlong haste or without warning

Other synonyms of suddenness include abruptness, precipitance, precipitancy, precipitateness.

suddenness (noun)	precipitousness (noun)
the quality of happening with headlong haste or without warning	the property possessed by a slope that is very steep
	the quality of happening with headlong haste or without warning