alimentary tract vs digestive tube

alimentary tract and digestive tube both are nouns.

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

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

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

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

alimentary tract (noun)	digestive tube (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