bodily cavity vs structure

bodily cavity and structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
bodily cavity	Yes	No	No	No
structure	Yes	No	Yes	No

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

bodily cavity: (anatomy) a natural hollow or sinus within the body
structure: a particular complex anatomical part of a living thing and its construction and arrangement

Other hypernyms of bodily cavity include anatomical structure, bodily structure, body structure, complex body part.

bodily cavity (noun)	structure (noun)
(anatomy) a natural hollow or sinus within the body	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

bodily cavity (verb)	structure (verb)
	give a structure to