anastomosis vs colligation

anastomosis and colligation both are nouns.

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

As nouns, colligation is a hypernym of anastomosis; that is, colligation 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
colligation: the state of being joined together

Other hypernyms of anastomosis include conjugation, conjunction, junction.

anastomosis (noun)	colligation (noun)
a natural or surgical joining of parts or branches of tubular structures so as to make or become continuous	the connection of isolated facts by a general hypothesis
	the state of being joined together