precipitous vs steep

precipitous is not a noun while steep is a noun.

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

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

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

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