fuzziness vs opaqueness

fuzziness and opaqueness both are nouns.

Word	Noun	Adjective	Verb	Adverb
fuzziness	Yes	No	No	No
opaqueness	Yes	No	No	No

As nouns, opaqueness is a hypernym of fuzziness; that is, opaqueness is a word with a broader meaning than fuzziness:

fuzziness: the quality of being indistinct and without sharp outlines
opaqueness: the quality of being opaque to a degree; the degree to which something reduces the passage of light

Other hypernyms of fuzziness include opacity.

fuzziness (noun)	opaqueness (noun)
the quality of being indistinct and without sharp outlines	the quality of being opaque to a degree; the degree to which something reduces the passage of light
	incomprehensibility resulting from obscurity of meaning