assault vs lash out

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

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

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

Other synonyms of assault include assail, attack, round, snipe.

assault (noun)	lash out (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

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