conscientiousness vs conscience

conscientiousness and conscience both are nouns.

Word	Noun	Adjective	Verb	Adverb
conscientiousness	Yes	No	No	No
conscience	Yes	No	No	No

As nouns, conscience is a hypernym of conscientiousness; that is, conscience is a word with a broader meaning than conscientiousness:

conscientiousness: the quality of being in accord with the dictates of conscience
conscience: conformity to one's own sense of right conduct

conscientiousness (noun)	conscience (noun)
the quality of being in accord with the dictates of conscience	conformity to one's own sense of right conduct
the trait of being painstaking and careful	a feeling of shame when you do something immoral
	motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions