milestone vs juncture

milestone and juncture both are nouns.

Word	Noun	Adjective	Verb	Adverb
milestone	Yes	No	No	No
juncture	Yes	No	No	No

As nouns, juncture is a hypernym of milestone; that is, juncture is a word with a broader meaning than milestone:

Other hypernyms of milestone include occasion.

milestone (noun)	juncture (noun)
stone post at side of a road to show distances	an event that occurs at a critical time
a significant event in your life (or in a project)	the shape or manner in which things come together and a connection is made
	a crisis situation or point in time when a critical decision must be made