soak up vs steep

soak up is not a noun while steep is a noun.

Word	Noun	Adjective	Verb	Adverb
soak up	No	No	Yes	No
steep	Yes	Yes	Yes	No

As verbs, soak up and steep are synonyms defined as:

Other synonyms of soak up include absorb, engross, engulf, immerse, plunge.

soak up (noun)	steep (noun)
	a steep place (as on a hill)

soak up (adjective)	steep (adjective)
	having a sharp inclination
	of a slope; set at a high angle
	greatly exceeding bounds of reason or moderation

soak up (verb)	steep (verb)
devote (oneself) fully to	let sit in a liquid to extract a flavor or to cleanse
take in, also metaphorically	devote (oneself) fully to