soaking up vs sorption

soaking up and sorption both are nouns.

Word	Noun	Adjective	Verb	Adverb
soaking up	Yes	No	No	No
sorption	Yes	No	No	No

As nouns, sorption is a hypernym of soaking up; that is, sorption is a word with a broader meaning than soaking up:

soaking up: (chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid
sorption: the process in which one substance takes up or holds another (by either absorption or adsorption)

soaking up (noun)	sorption (noun)
(chemistry) a process in which one substance permeates another; a fluid permeates or is dissolved by a liquid or solid	the process in which one substance takes up or holds another (by either absorption or adsorption)