appendage vs body part

appendage and body part both are nouns.

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

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

appendage: a natural prolongation or projection from a part of an organism either animal or plant
body part: any part of an organism such as an organ or extremity

appendage (noun)	body part (noun)
a part that is joined to something larger	any part of an organism such as an organ or extremity
an external body part that projects from the body
a natural prolongation or projection from a part of an organism either animal or plant