digestive system vs gastrointestinal system

digestive system and gastrointestinal system both are nouns.

Word	Noun	Adjective	Verb	Adverb
digestive system	Yes	No	No	No
gastrointestinal system	Yes	No	No	No

As nouns, digestive system and gastrointestinal system are synonyms defined as:

digestive system and gastrointestinal system: the system that makes food absorbable into the body

Other synonyms of digestive system include systema alimentarium, systema digestorium.

digestive system (noun)	gastrointestinal system (noun)
the system that makes food absorbable into the body	the system that makes food absorbable into the body