bump into vs knock against

bump into and knock against both are verbs.

Word	Noun	Adjective	Verb	Adverb
bump into	No	No	Yes	No
knock against	No	No	Yes	No

As verbs, bump into and knock against are synonyms defined as:

Other synonyms of bump into include butt against, jar against, run into.

bump into (verb)	knock against (verb)
collide violently with an obstacle	collide violently with an obstacle