amaurosis vs vision defect

amaurosis and vision defect both are nouns.

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

As nouns, vision defect is a hypernym of amaurosis; that is, vision 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
vision defect: impairment of the sense of sight

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

amaurosis (noun)	vision 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