jar against vs butt against

jar against and butt against both are verbs.

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

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

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

jar against (verb)	butt against (verb)
collide violently with an obstacle	lie adjacent to another or share a boundary
	collide violently with an obstacle