anastomosis vs junction

anastomosis and junction both are nouns.

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

As nouns, junction is a hypernym of anastomosis; that is, junction is a word with a broader meaning than anastomosis:

anastomosis: a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous
junction: the state of being joined together

Other hypernyms of anastomosis include colligation, conjugation, conjunction.

anastomosis (noun)	junction (noun)
a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous	an act of joining or adjoining things
	the place where two or more things come together
	something that joins or connects
	the shape or manner in which things come together and a connection is made
	the state of being joined together