abuse vs lash out

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

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

As verbs, lash out is a hypernym of abuse; that is, lash out is a word with a broader meaning than abuse:

Other hypernyms of abuse include assail, assault, attack, round, snipe.

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

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