muscular structure vs system

muscular structure and system both are nouns.

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

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

muscular structure (noun)	system (noun)
the muscular system of an organism	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