digestive system vs system

digestive system and system both are nouns.

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

As nouns, system is a hypernym of digestive system; that is, system is a word with a broader meaning than digestive system:

digestive system (noun)	system (noun)
the system that makes food absorbable into the body	instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity
	an ordered manner; orderliness by virtue of being methodical and well organized
	a group of physiologically or anatomically related organs or parts
	the living body considered as made up of interdependent components forming a unified whole
	a complex of methods or rules governing behavior
	a procedure or process for obtaining an objective
	an organized structure for arranging or classifying
	a group of independent but interrelated elements comprising a unified whole
	(physical chemistry) a sample of matter in which substances in different phases are in equilibrium