mop up vs ending

mop up and ending both are nouns.

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

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

Other hypernyms of mop up include conclusion, termination.

mop up (noun)	ending (noun)
a concluding action	the act of ending something
	the end of a word (a suffix or inflectional ending or final morpheme)
	the last section of a communication
	event whose occurrence ends something
	the point in time at which something ends

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