faultlessness vs impeccability

faultlessness and impeccability both are nouns.

Word	Noun	Adjective	Verb	Adverb
faultlessness	Yes	No	No	No
impeccability	Yes	No	No	No

As nouns, faultlessness and impeccability are synonyms defined as:

faultlessness and impeccability: the quality of being without an error or fault

faultlessness (noun)	impeccability (noun)
the quality of being without an error or fault	the quality of being exempt from sin or incapable of sinning
	the quality of being without an error or fault