assault vs onslaught

assault and onslaught both are nouns.

Word	Noun	Adjective	Verb	Adverb
assault	Yes	No	Yes	No
onslaught	Yes	No	No	No

assault (noun)	onslaught (noun)
close fighting during the culmination of a military attack	(military) an offensive against an enemy (using weapons)
a threatened or attempted physical attack by someone who appears to be able to cause bodily harm if not stopped	the rapid and continuous delivery of linguistic communication (spoken or written)
the crime of forcing a person to submit to sexual intercourse against his or her will	a sudden and severe onset of trouble

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