junction vs joint

junction and joint both are nouns.

Word	Noun	Adjective	Verb	Adverb
junction	Yes	No	No	No
joint	Yes	Yes	Yes	No

As nouns, joint is a hyponym of junction; that is, joint is a word with a more specific, narrower meaning than junction:

Other hyponyms of junction include contact, tangency, barrier strip, junction barrier, splice, splicing, thermojunction.

As nouns, junction and joint are synonyms defined as:

junction and joint: the shape or manner in which things come together and a connection is made

Other synonyms of junction include articulation, join, juncture.

junction (noun)	joint (noun)
an act of joining or adjoining things	marijuana leaves rolled into a cigarette for smoking
the place where two or more things come together	junction by which parts or objects are joined together
something that joins or connects	a disreputable place of entertainment
the shape or manner in which things come together and a connection is made	(anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion)
the state of being joined together	a piece of meat roasted or for roasting and of a size for slicing into more than one portion
	the shape or manner in which things come together and a connection is made

junction (adjective)	joint (adjective)
	united or combined
	involving both houses of a legislature
	affecting or involving two or more