bombing vs onrush

bombing and onrush both are nouns.

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

As nouns, onrush is a hypernym of bombing; that is, onrush is a word with a broader meaning than bombing:

Other hypernyms of bombing include attack, onset, onslaught.

bombing (noun)	onrush (noun)
an attack by dropping bombs	(military) an offensive against an enemy (using weapons)
the use of bombs for sabotage; a tactic frequently used by terrorists	a forceful forward rush or flow