war machine vs onslaught

war machine and onslaught both are nouns.

Word	Noun	Adjective	Verb	Adverb
war machine	Yes	No	No	No
onslaught	Yes	No	No	No

war machine (noun)	onslaught (noun)
the military forces of a nation	(military) an offensive against an enemy (using weapons)
	the rapid and continuous delivery of linguistic communication (spoken or written)
	a sudden and severe onset of trouble