filum vs complex body part

filum and complex body part both are nouns.

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

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

filum: a threadlike structure (as a chainlike series of cells)
complex body part: a particular complex anatomical part of a living thing and its construction and arrangement

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

filum (noun)	complex body part (noun)
a threadlike structure (as a chainlike series of cells)	a particular complex anatomical part of a living thing and its construction and arrangement