lash out vs assault

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

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

As verbs, lash out and assault are synonyms defined as:

Other synonyms of lash out include assail, attack, round, snipe.

lash out (noun)	assault (noun)
	close fighting during the culmination of a military attack
	a threatened or attempted physical attack by someone who appears to be able to cause bodily harm if not stopped
	the crime of forcing a person to submit to sexual intercourse against his or her will

lash out (verb)	assault (verb)
attack in speech or writing	attack in speech or writing
	attack someone physically or emotionally
	force (someone) to have sex against their will