branchial cleft vs structure

branchial cleft and structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
branchial cleft	Yes	No	No	No
structure	Yes	No	Yes	No

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

branchial cleft: one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes
structure: a particular complex anatomical part of a living thing and its construction and arrangement

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

branchial cleft (noun)	structure (noun)
one of a series of slit openings in the pharynxes of fishes and aquatic amphibians through which water passes	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

branchial cleft (verb)	structure (verb)
	give a structure to