precipitancy vs precipitousness

precipitancy and precipitousness both are nouns.

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

As nouns, precipitancy and precipitousness are synonyms defined as:

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

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

precipitancy (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