discolouration vs visual aspect

discolouration and visual aspect both are nouns.

Word	Noun	Adjective	Verb	Adverb
discolouration	Yes	No	No	No
visual aspect	Yes	No	No	No

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

Other hypernyms of discolouration include appearance.

discolouration (noun)	visual aspect (noun)
the act of changing the natural color of something by making it duller or dingier or unnatural or faded	outward or visible aspect of a person or thing
a soiled or discolored appearance