structure vs system

structure and system both are nouns.

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

As nouns, system is a hyponym of structure; that is, system is a word with a more specific, narrower meaning than structure:

structure: the complex composition of knowledge as elements and their combinations
system: an organized structure for arranging or classifying

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

structure: the people in a society considered as a system organized by a characteristic pattern of relationships
system: a group of independent but interrelated elements comprising a unified whole

Other hypernyms of structure include scheme.

structure (noun)	system (noun)
a thing constructed; a complex entity constructed of many parts	instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity
the manner of construction of something and the arrangement of its parts	an ordered manner; orderliness by virtue of being methodical and well organized
a particular complex anatomical part of a living thing and its construction and arrangement	a group of physiologically or anatomically related organs or parts
the complex composition of knowledge as elements and their combinations	the living body considered as made up of interdependent components forming a unified whole
the people in a society considered as a system organized by a characteristic pattern of relationships	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

structure (verb)	system (verb)
give a structure to