envisioning vs imagination

envisioning and imagination both are nouns.

Word	Noun	Adjective	Verb	Adverb
envisioning	Yes	No	No	No
imagination	Yes	No	No	No

As nouns, imagination is a hypernym of envisioning; that is, imagination is a word with a broader meaning than envisioning:

Other hypernyms of envisioning include imagery, imaging, mental imagery.

envisioning (noun)	imagination (noun)
visual imagery	the formation of a mental image of something that is not perceived as real and is not present to the senses
	the ability to form mental images of things or events
	the ability to deal resourcefully with unusual problems