jugal bone vs os

jugal bone and os both are nouns.

Word	Noun	Adjective	Verb	Adverb
jugal bone	Yes	No	No	No
os	Yes	No	No	No

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

jugal bone: the arch of bone beneath the eye that forms the prominence of the cheek
os: rigid connective tissue that makes up the skeleton of vertebrates

Other hypernyms of jugal bone include bone.

jugal bone (noun)	os (noun)
the arch of bone beneath the eye that forms the prominence of the cheek	rigid connective tissue that makes up the skeleton of vertebrates
	a mouth or mouthlike opening