chiasm vs complex body part

chiasm and complex body part both are nouns.

Word	Noun	Adjective	Verb	Adverb
chiasm	Yes	No	No	No
complex body part	Yes	No	No	No

As nouns, complex body part is a hypernym of chiasm; that is, complex body part is a word with a broader meaning than chiasm:

chiasm: an intersection or crossing of two tracts in the form of the letter X
complex body part: a particular complex anatomical part of a living thing and its construction and arrangement

Other hypernyms of chiasm include anatomical structure, bodily structure, body structure, structure.

chiasm (noun)	complex body part (noun)
an intersection or crossing of two tracts in the form of the letter X	a particular complex anatomical part of a living thing and its construction and arrangement