complex body part vs body part

complex body part and body part both are nouns.

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

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

complex body part: a particular complex anatomical part of a living thing and its construction and arrangement
body part: any part of an organism such as an organ or extremity

complex body part (noun)	body part (noun)
a particular complex anatomical part of a living thing and its construction and arrangement	any part of an organism such as an organ or extremity