falseness vs unfaithfulness

falseness and unfaithfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
falseness	Yes	No	No	No
unfaithfulness	Yes	No	No	No

As nouns, unfaithfulness is a hypernym of falseness; that is, unfaithfulness is a word with a broader meaning than falseness:

Other hypernyms of falseness include infidelity.

falseness (noun)	unfaithfulness (noun)
the quality of not being open or truthful; deceitful or hypocritical	the quality of being unfaithful
unfaithfulness by virtue of being unreliable or treacherous
the state of being false or untrue