os zygomaticum vs zygomatic bone

os zygomaticum and zygomatic bone both are nouns.

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

As nouns, os zygomaticum and zygomatic bone are synonyms defined as:

os zygomaticum and zygomatic bone: the arch of bone beneath the eye that forms the prominence of the cheek

Other synonyms of os zygomaticum include cheekbone, jugal bone, malar, malar bone, zygomatic.

os zygomaticum (noun)	zygomatic bone (noun)
the arch of bone beneath the eye that forms the prominence of the cheek	the arch of bone beneath the eye that forms the prominence of the cheek