vermiform appendix vs outgrowth

vermiform appendix and outgrowth both are nouns.

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

As nouns, outgrowth is a hypernym of vermiform appendix; that is, outgrowth 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
outgrowth: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of vermiform appendix include appendage, process.

vermiform appendix (noun)	outgrowth (noun)
a vestigial process that extends from the lower end of the cecum and that resembles a small pouch	a natural prolongation or projection from a part of an organism either animal or plant
	the gradual beginning or coming forth
	a natural consequence of development