amaurosis vs visual impairment

amaurosis and visual impairment both are nouns.

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

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

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

amaurosis (noun)	visual impairment (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