superciliary ridge vs superciliary arch

superciliary ridge and superciliary arch both are nouns.

Word	Noun	Adjective	Verb	Adverb
superciliary ridge	Yes	No	No	No
superciliary arch	Yes	No	No	No

As nouns, superciliary ridge and superciliary arch are synonyms defined as:

superciliary ridge and superciliary arch: a ridge on the frontal bone above the eye socket

Other synonyms of superciliary ridge include supraorbital ridge, supraorbital torus.

superciliary ridge (noun)	superciliary arch (noun)
a ridge on the frontal bone above the eye socket	a ridge on the frontal bone above the eye socket