achromatic vision vs vision

achromatic vision and vision both are nouns.

Word	Noun	Adjective	Verb	Adverb
achromatic vision	Yes	No	No	No
vision	Yes	No	No	No

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

Other hypernyms of achromatic vision include sight, visual modality, visual sense.

achromatic vision (noun)	vision (noun)
vision using the rods	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