digestive tube vs gastrointestinal tract

digestive tube and gastrointestinal tract both are nouns.

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

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

digestive tube and gastrointestinal 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, GI tract.

digestive tube (noun)	gastrointestinal 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