infidelity vs falseness

infidelity and falseness both are nouns.

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

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

Other hyponyms of infidelity include faithlessness, fickleness, inconstancy, disloyalty, adulterousness.

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