bloodstain vs discolouration

bloodstain and discolouration both are nouns.

Word	Noun	Adjective	Verb	Adverb
bloodstain	Yes	No	No	No
discolouration	Yes	No	No	No

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

Other hypernyms of bloodstain include discoloration, stain.

bloodstain (noun)	discolouration (noun)
a discoloration caused by blood	the act of changing the natural color of something by making it duller or dingier or unnatural or faded
	a soiled or discolored appearance