faultiness vs sickness

faultiness and sickness both are nouns.

Word	Noun	Adjective	Verb	Adverb
faultiness	Yes	No	No	No
sickness	Yes	No	No	No

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

Other hyponyms of faultiness include bugginess, lameness, dysfunctionality.

faultiness (noun)	sickness (noun)
the state of being defective	impairment of normal physiological function affecting part or all of an organism
	the state that precedes vomiting
	defectiveness or unsoundness