aster vs complex body part

aster and complex body part both are nouns.

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

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

aster: star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis
complex body part: a particular complex anatomical part of a living thing and its construction and arrangement

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

aster (noun)	complex body part (noun)
star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis	a particular complex anatomical part of a living thing and its construction and arrangement
any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers