digestive tract vs GI tract

digestive tract and GI tract both are nouns.

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

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

digestive tract 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 tract include alimentary canal, alimentary tract, digestive tube, gastrointestinal tract.

digestive tract (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