vision vs mental imagery

vision and mental imagery both are nouns.

Word	Noun	Adjective	Verb	Adverb
vision	Yes	No	No	No
mental imagery	Yes	No	No	No

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

Other hypernyms of vision include imagery, imagination, imaging.

vision (noun)	mental imagery (noun)
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