appendage vs external body part

appendage and external body part both are nouns.

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

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

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