eat up vs abuse

eat up is not a noun while abuse is a noun.

Word	Noun	Adjective	Verb	Adverb
eat up	No	No	Yes	No
abuse	Yes	No	Yes	No

As verbs, abuse is a hyponym of eat up; that is, abuse is a word with a more specific, narrower meaning than eat up:

eat up (noun)	abuse (noun)
	improper or excessive use
	cruel or inhumane treatment
	a rude expression intended to offend or hurt

eat up (verb)	abuse (verb)
finish eating all the food on one's plate or on the table	change the inherent purpose or function of something
use up (resources or materials)	use wrongly or improperly or excessively
enclose or envelop completely, as if by swallowing	use foul or abusive language towards
	treat badly