zygomatic vs os

zygomatic and os both are nouns.

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

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

zygomatic: 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 zygomatic include bone.

zygomatic (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

zygomatic (adjective)	os (adjective)
of or relating to the cheek region of the face