steepness vs precipitousness

steepness and precipitousness both are nouns.

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

As nouns, steepness and precipitousness are synonyms defined as:

steepness and precipitousness: the property possessed by a slope that is very steep

Other synonyms of steepness include abruptness.

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