imaging vs vision

imaging and vision both are nouns.

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

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

imaging (noun)	vision (noun)
(medicine) obtaining pictures of the interior of the body	the ability to see; the visual faculty
the ability to form mental images of things or events	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