lacrimal apparatus vs structure

lacrimal apparatus and structure both are nouns.

Word	Noun	Adjective	Verb	Adverb
lacrimal apparatus	Yes	No	No	No
structure	Yes	No	Yes	No

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

lacrimal apparatus: the structures that secrete and drain tears from the eye
structure: a particular complex anatomical part of a living thing and its construction and arrangement

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

lacrimal apparatus (noun)	structure (noun)
the structures that secrete and drain tears from the eye	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

lacrimal apparatus (verb)	structure (verb)
	give a structure to