sense datum vs vision

sense datum and vision both are nouns.

Word	Noun	Adjective	Verb	Adverb
sense datum	Yes	No	No	No
vision	Yes	No	No	No

As nouns, vision is a hyponym of sense datum; that is, vision is a word with a more specific, narrower meaning than sense datum:

sense datum (noun)	vision (noun)
an unelaborated elementary awareness of stimulation	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