class structure vs structure

class structure and structure both are nouns.

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

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

class structure: the organization of classes within a society
structure: the people in a society considered as a system organized by a characteristic pattern of relationships

Other hypernyms of class structure include social organisation, social organization, social structure, social system.

class structure (noun)	structure (noun)
the organization of classes within a society	a thing constructed; a complex entity constructed of many parts
	the manner of construction of something and the arrangement of its parts
	a particular complex anatomical part of a living thing and its construction and arrangement
	the complex composition of knowledge as elements and their combinations
	the people in a society considered as a system organized by a characteristic pattern of relationships

class structure (verb)	structure (verb)
	give a structure to