softness vs faintness

softness and faintness both are nouns.

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

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

Other hyponyms of softness include decrescendo, diminuendo, pianissimo, piano.

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

Other hyponyms of softness include dimness, vagueness.

softness (noun)	faintness (noun)
the property of giving little resistance to pressure and being easily cut or molded	the quality of being dim or lacking contrast
a sound property that is free from loudness or stridency	barely audible
a disposition to be lenient in judging others	the property of being without strength
acting in a manner that is gentle and mild and even-tempered	the trait of lacking boldness and courage
the trait of being effeminate (derogatory of a man)	a feeling of faintness and of being ready to swoon
the quality of being indistinct and without sharp outlines
a visual property that is subdued and free from brilliance or glare
a state of declining economic condition
poor physical condition; being out of shape or out of condition (as from a life of ease and luxury)
the quality of weather that is deliciously mild and soothing