steep vs soak up

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

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

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

Other synonyms of steep include absorb, engross, engulf, immerse, plunge.

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

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

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