shine vs shininess

shine and shininess both are nouns.

Word	Noun	Adjective	Verb	Adverb
shine	Yes	No	Yes	No
shininess	Yes	No	No	No

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

shine: the quality of being bright and sending out rays of light
shininess: the visual property of something that shines with reflected light

Other hyponyms of shine include gleam, gleaming, glow, lambency, luster, lustre, sheen, burnish, gloss, glossiness, polish.

shine (noun)	shininess (noun)
the quality of being bright and sending out rays of light	the visual property of something that shines with reflected light

shine (verb)	shininess (verb)
make (a surface) shine
experience a feeling of well-being or happiness, as from good health or an intense emotion
be shiny, as if wet
have a complexion with a strong bright color, such as red or pink
touch or seem as if touching visually or audibly
be distinguished or eminent
be clear and obvious
emit light; be bright, as of the sun or a light
be bright by reflecting or casting light
throw or flash the light of (a lamp)