bombing run vs bombing

bombing run and bombing both are nouns.

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

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

bombing run: that part of the flight that begins with the approach to the target; includes target acquisition and ends with the release of the bombs
bombing: an attack by dropping bombs

Other hypernyms of bombing run include bombardment.

bombing run (noun)	bombing (noun)
that part of the flight that begins with the approach to the target; includes target acquisition and ends with the release of the bombs	an attack by dropping bombs
	the use of bombs for sabotage; a tactic frequently used by terrorists