gut vs small intestine

gut and small intestine both are nouns.

Word	Noun	Adjective	Verb	Adverb
gut	Yes	No	Yes	No
small intestine	Yes	No	No	No

As nouns, small intestine is a hyponym of gut; that is, small intestine is a word with a more specific, narrower meaning than gut:

gut: the part of the alimentary canal between the stomach and the anus
small intestine: the longest part of the alimentary canal; where digestion is completed

Other hyponyms of gut include large intestine.

gut (noun)	small intestine (noun)
a strong cord made from the intestines of sheep and used in surgery	the longest part of the alimentary canal; where digestion is completed
the part of the alimentary canal between the stomach and the anus
a narrow channel or strait

gut (verb)	small intestine (verb)
remove the guts of
empty completely; destroy the inside of