opaqueness vs fuzziness

opaqueness and fuzziness both are nouns.

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

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

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

Other hyponyms of opaqueness include cloudiness, muddiness, murkiness, blurriness, fogginess, indistinctness, softness.

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