visual image vs percept

visual image and percept both are nouns.

Word	Noun	Adjective	Verb	Adverb
visual image	Yes	No	No	No
percept	Yes	No	No	No

As nouns, percept is a hypernym of visual image; that is, percept is a word with a broader meaning than visual image:

visual image: a percept that arises from the eyes; an image in the visual system
percept: the representation of what is perceived; basic component in the formation of a concept

Other hypernyms of visual image include perception, perceptual experience.

visual image (noun)	percept (noun)
a percept that arises from the eyes; an image in the visual system	the representation of what is perceived; basic component in the formation of a concept
a mental image that is similar to a visual perception