run into vs bang

run into is not a noun while bang is a noun.

Word	Noun	Adjective	Verb	Adverb
run into	No	No	Yes	No
bang	Yes	No	Yes	Yes

As verbs, bang is a hyponym of run into; that is, bang is a word with a more specific, narrower meaning than run into:

run into (noun)	bang (noun)
	a conspicuous success
	a border of hair that is cut short and hangs across the forehead
	a sudden very loud noise
	a vigorous blow
	the swift release of a store of affective force

run into (verb)	bang (verb)
collide violently with an obstacle	strike violently
hit against; come into sudden contact with	close violently
come together	leap, jerk, bang
be beset by	have sexual intercourse with
	move noisily
	to produce a sharp often metallic explosive or percussive sound

run into (adverb)	bang (adverb)
	directly