get through vs mop up

get through is not a noun while mop up is a noun.

Word	Noun	Adjective	Verb	Adverb
get through	No	No	Yes	No
mop up	Yes	No	Yes	No

As verbs, get through and mop up are synonyms defined as:

Other synonyms of get through include clear up, finish off, finish up, polish off, wrap up.

get through (noun)	mop up (noun)
	a concluding action

get through (verb)	mop up (verb)
finish a task completely	finish a task completely
become clear or enter one's consciousness or emotions	defeat thoroughly
be in or establish communication with	to wash or wipe with or as if with a mop
succeed in reaching a real or abstract destination after overcoming problems
spend or pass, as with boredom or in a pleasant manner; of time