amaurosis vs visual defect

amaurosis and visual defect both are nouns.

Word	Noun	Adjective	Verb	Adverb
amaurosis	Yes	No	No	No
visual defect	Yes	No	No	No

As nouns, visual defect is a hypernym of amaurosis; that is, visual defect is a word with a broader meaning than amaurosis:

amaurosis: partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain
visual defect: impairment of the sense of sight

Other hypernyms of amaurosis include vision defect, visual disorder, visual impairment.

amaurosis (noun)	visual defect (noun)
partial or total loss of sight without pathology of the eye; caused by disease of optic nerve or retina or brain	impairment of the sense of sight