lash out vs abuse

lash out is not a noun while abuse is a noun.

Word	Noun	Adjective	Verb	Adverb
lash out	No	No	Yes	No
abuse	Yes	No	Yes	No

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

Other hyponyms of lash out include blackguard, clapperclaw, shout, claw, vitriol, rip, whang, barrage, bombard, blister, scald, scorch, whip, rubbish.

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

lash out (verb)	abuse (verb)
attack in speech or writing	change the inherent purpose or function of something
	use wrongly or improperly or excessively
	use foul or abusive language towards
	treat badly