steep vs precipitous

steep is a noun but precipitous is not a noun.

Word	Noun	Adjective	Verb	Adverb
steep	Yes	Yes	Yes	No
precipitous	No	Yes	No	No

steep (noun)	precipitous (noun)
a steep place (as on a hill)

steep (adjective)	precipitous (adjective)
having a sharp inclination	done with very great haste and without due deliberation
of a slope; set at a high angle	dangerously steep
greatly exceeding bounds of reason or moderation

steep (verb)	precipitous (verb)
let sit in a liquid to extract a flavor or to cleanse
devote (oneself) fully to