abrupt vs steep

abrupt is not a noun while steep is a noun.

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

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

abrupt (adjective)	steep (adjective)
surprisingly and unceremoniously brusque in manner	having a sharp inclination
marked by sudden changes in subject and sharp transitions	of a slope; set at a high angle
dangerously steep	greatly exceeding bounds of reason or moderation
exceedingly sudden and unexpected

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