alimentary canal vs digestive tract

alimentary canal and digestive tract both are nouns.

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

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

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

alimentary canal (noun)	digestive 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