blurriness vs faintness

blurriness and faintness both are nouns.

Word	Noun	Adjective	Verb	Adverb
blurriness	Yes	No	No	No
faintness	Yes	No	No	No

As nouns, faintness is a hyponym of blurriness; that is, faintness is a word with a more specific, narrower meaning than blurriness:

Other hyponyms of blurriness include dimness, vagueness.

blurriness (noun)	faintness (noun)
the quality of being indistinct and without sharp outlines	the quality of being dim or lacking contrast
	barely audible
	the property of being without strength
	the trait of lacking boldness and courage
	a feeling of faintness and of being ready to swoon