intestinal obstruction vs ileus

intestinal obstruction and ileus both are nouns.

Word	Noun	Adjective	Verb	Adverb
intestinal obstruction	Yes	No	No	No
ileus	Yes	No	No	No

As nouns, intestinal obstruction and ileus are synonyms defined as:

intestinal obstruction and ileus: blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel

intestinal obstruction (noun)	ileus (noun)
blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel	blockage of the intestine (especially the ileum) that prevents the contents of the intestine from passing to the lower bowel