mop up vs completion

mop up and completion both are nouns.

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

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

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

mop up (noun)	completion (noun)
a concluding action	a concluding action
	(American football) a successful forward pass in football

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