intestine vs internal organ

intestine and internal organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
intestine	Yes	No	No	No
internal organ	Yes	No	No	No

As nouns, internal organ is a hypernym of intestine; that is, internal organ is a word with a broader meaning than intestine:

intestine: the part of the alimentary canal between the stomach and the anus
internal organ: a main organ that is situated inside the body

Other hypernyms of intestine include viscus.

intestine (noun)	internal organ (noun)
the part of the alimentary canal between the stomach and the anus	a main organ that is situated inside the body