mop up vs closing

mop up and closing both are nouns.

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

As nouns, mop up and closing are synonyms defined as:

Other synonyms of mop up include completion, culmination, windup.

mop up (noun)	closing (noun)
a concluding action	termination of operations
	the act of closing something
	a concluding action
	approaching a particular destination; a coming closer; a narrowing of a gap
	the last section of a communication

mop up (adjective)	closing (adjective)
	final or ending

mop up (verb)	closing (verb)
finish a task completely
defeat thoroughly
to wash or wipe with or as if with a mop