scapula vs os

scapula and os both are nouns.

Word	Noun	Adjective	Verb	Adverb
scapula	Yes	No	No	No
os	Yes	No	No	No

As nouns, os is a hypernym of scapula; that is, os is a word with a broader meaning than scapula:

scapula: either of two flat triangular bones one on each side of the shoulder in human beings
os: rigid connective tissue that makes up the skeleton of vertebrates

Other hypernyms of scapula include bone.

scapula (noun)	os (noun)
either of two flat triangular bones one on each side of the shoulder in human beings	rigid connective tissue that makes up the skeleton of vertebrates
	a mouth or mouthlike opening