onrush vs diversion

onrush and diversion both are nouns.

Word	Noun	Adjective	Verb	Adverb
onrush	Yes	No	No	No
diversion	Yes	No	No	No

As nouns, diversion is a hyponym of onrush; that is, diversion is a word with a more specific, narrower meaning than onrush:

onrush: (military) an offensive against an enemy (using weapons)
diversion: an attack calculated to draw enemy defense away from the point of the principal attack

onrush (noun)	diversion (noun)
(military) an offensive against an enemy (using weapons)	an activity that diverts or amuses or stimulates
a forceful forward rush or flow	a turning aside (of your course or attention or concern)
	an attack calculated to draw enemy defense away from the point of the principal attack