vermiform appendix vs appendage

vermiform appendix and appendage both are nouns.

Word	Noun	Adjective	Verb	Adverb
vermiform appendix	Yes	No	No	No
appendage	Yes	No	No	No

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

vermiform appendix: a vestigial process that extends from the lower end of the cecum and that resembles a small pouch
appendage: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of vermiform appendix include outgrowth, process.

vermiform appendix (noun)	appendage (noun)
a vestigial process that extends from the lower end of the cecum and that resembles a small pouch	a part that is joined to something larger
	an external body part that projects from the body
	a natural prolongation or projection from a part of an organism either animal or plant