arcus zygomaticus vs zygoma

arcus zygomaticus and zygoma both are nouns.

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

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

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

Other synonyms of arcus zygomaticus include zygomatic arch.

arcus zygomaticus (noun)	zygoma (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