plexus vs complex body part

plexus and complex body part both are nouns.

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

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

plexus: a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels
complex body part: a particular complex anatomical part of a living thing and its construction and arrangement

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

plexus (noun)	complex body part (noun)
a network of intersecting blood vessels or intersecting nerves or intersecting lymph vessels	a particular complex anatomical part of a living thing and its construction and arrangement