visual acuity vs vision

visual acuity and vision both are nouns.

Word	Noun	Adjective	Verb	Adverb
visual acuity	Yes	No	No	No
vision	Yes	No	No	No

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

visual acuity: sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)
vision: the ability to see; the visual faculty

Other hypernyms of visual acuity include sight, visual modality, visual sense.

visual acuity (noun)	vision (noun)
sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart)	the ability to see; the visual faculty
	the perceptual experience of seeing
	a vivid mental image
	the formation of a mental image of something that is not perceived as real and is not present to the senses
	a religious or mystical experience of a supernatural appearance