knock against vs jar against

knock against and jar against both are verbs.

Word	Noun	Adjective	Verb	Adverb
knock against	No	No	Yes	No
jar against	No	No	Yes	No

As verbs, knock against and jar against are synonyms defined as:

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

knock against (verb)	jar against (verb)
collide violently with an obstacle	collide violently with an obstacle