acromion vs appendage

acromion and appendage both are nouns.

Word	Noun	Adjective	Verb	Adverb
acromion	Yes	No	No	No
appendage	Yes	No	No	No

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

acromion: the outermost point of the spine of the shoulder blade
appendage: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of acromion include outgrowth, process.

acromion (noun)	appendage (noun)
the outermost point of the spine of the shoulder blade	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