digestive tube vs GI tract

digestive tube and GI tract both are nouns.

Word	Noun	Adjective	Verb	Adverb
digestive tube	Yes	No	No	No
GI tract	Yes	No	No	No

As nouns, digestive tube and GI tract are synonyms defined as:

digestive tube and GI tract: tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination

Other synonyms of digestive tube include alimentary canal, alimentary tract, digestive tract, gastrointestinal tract.

digestive tube (noun)	GI tract (noun)
tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination	tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination