faintness vs fogginess

faintness and fogginess both are nouns.

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

As nouns, fogginess is a hypernym of faintness; that is, fogginess is a word with a broader meaning than faintness:

Other hypernyms of faintness include blurriness, fuzziness, indistinctness, softness.

faintness (noun)	fogginess (noun)
the quality of being dim or lacking contrast	the quality of being indistinct and without sharp outlines
barely audible	an atmosphere in which visibility is reduced because of a cloud of some substance
the property of being without strength
the trait of lacking boldness and courage
a feeling of faintness and of being ready to swoon