zygoma vs arcus zygomaticus

zygoma and arcus zygomaticus both are nouns.

Word	Noun	Adjective	Verb	Adverb
zygoma	Yes	No	No	No
arcus zygomaticus	Yes	No	No	No

As nouns, zygoma and arcus zygomaticus are synonyms defined as:

zygoma and arcus zygomaticus: the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone

Other synonyms of zygoma include zygomatic arch.

zygoma (noun)	arcus zygomaticus (noun)
the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone	the slender arch formed by the temporal process of the cheekbone that bridges to the zygomatic process of the temporal bone