mop up vs absorb

mop up is a noun but absorb is not a noun.

Word	Noun	Adjective	Verb	Adverb
mop up	Yes	No	Yes	No
absorb	No	No	Yes	No

As verbs, absorb is a hypernym of mop up; that is, absorb is a word with a broader meaning than mop up:

Other hypernyms of mop up include draw, imbibe, soak up, sop up, suck, suck up, take in, take up.

mop up (noun)	absorb (noun)
a concluding action

mop up (verb)	absorb (verb)
finish a task completely	cause to become one with
defeat thoroughly	take up mentally
to wash or wipe with or as if with a mop	consume all of one's attention or time
	devote (oneself) fully to
	take in, also metaphorically
	become imbued
	assimilate or take in
	take up, as of debts or payments
	suck or take up or in